Статті в журналах: "Ferrite de Bismuth"

1

Wang, Xinxin, and Yifa Dong. "Studies on the Preparation and Photocatalytic Performance of Bismuth Ferrite." E3S Web of Conferences 245 (2021): 03078. http://dx.doi.org/10.1051/e3sconf/202124503078.

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Iron oxide and bismuth oxide powder are synthesized by the liquid phase precipitation method. Then a certain proportion of iron oxide, bismuth oxide and sodium chloride are mixed and ground to prepare the bismuth ferrite precursor by the molten salt method. The bismuth ferrite precursors are calcined at different temperatures to obtain bismuth ferrite photocatalyst. By studying the degradation performance of bismuth oxide, iron oxide and bismuth ferrite photocatalysts for methyl orange dyes, the best conditions for the degradation of methyl orange dyes by bismuth ferrite photocatalysts are found. The experimental results show that the bismuth ferrite prepared by calcining at 750°C has the best degradation. Compared with a single oxide, the photocatalytic performance of bismuth ferrite is better.

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2

Sarkar, Kakali, Soumya Mukherjee, and Siddhartha Mukherjee. "Structural, electrical and magnetic behaviour of undoped and nickel doped nanocrystalline bismuth ferrite by solution combustion route." Processing and Application of Ceramics 9, no. 1 (2015): 53–60. http://dx.doi.org/10.2298/pac1501053s.

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Multiferroic bismuth ferrite (BFO) and Ni-doped bismuth ferrites, with perovskite structure, were synthesized by chemical route at the temperatures ranging from 500 to 600 ?C in controlled atmosphere. The structural phase analysis of materials was identified by XRD and crystallite size was calculated from the half width measurement of the well defined major XRD diffraction peak. Average crystallite size was calculated by applying Scherrer?s formula and found to have values in the range from 14 to 35 nm. FESEM was used to evaluate the morphology and structural formation of nanocrystallite grains, while EDX confirmed elemental composition including the presence of dopant in the matrix. Dielectric properties and effect of electric field on polarization behaviour were studied for both undoped and Ni-doped BFO. Doping shows a clear change in ferroelectric behaviour. Antiferromagnetic nature of bulk bismuth ferrite transforms to superparamagnetic strong ferroelectric nature for both undoped and nickel doped nanocrystalline bismuth ferrite due to its close dimension of crystallite size with magnetic domains leading to break-down of frustrated spin cycloidal moment. The superparamagnetism behaviour is more pronounced for the nickel doped BFO though magnetic saturation is slightly higher for the undoped nanocrystalline bismuth ferrite.

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3

Deng, Xiao Ling, Xing Bing Liu, Wei Cai, Chun Lin Fu, and Jia Mu Huang. "The Influence of Sintering Temperature on the Microstructure and Electrical Properties of BiFeO₃ Ceramics." Key Engineering Materials 602-603 (March 2014): 942–46. http://dx.doi.org/10.4028/www.scientific.net/kem.602-603.942.

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This study reports the synthesis of bismuth ferrite ceramics (BiFeO3, BFO) by the sol-gel method and the effect of different sintering temperatures (800 °C, 820 °C, 850 °C, 880 °C, 900 °C) on the crystal structure, morphology, dielectric properties and ferroelectric properties of the bismuth ferrite ceramics. It is observed that the bismuth ferrite phase are formed when the molar ratio of bismuth and ferric is 1.025 : 1, and the bismuth ferrite ceramics have less impurity phase at all the five sintering temperature. The morphology studies revealed that the grain of bismuth ferrite ceramics is spherical and the grain size increases with the increasing of the sintering temperature. When the bismuth ferrite ceramics with excessive bismuth sintered at 820 °C, it exhibits the higher dielectric constant and the lower dielectric loss, the remnant polarization and the coercive field are 0.35 μC/cm2 and 4.03kV/cm, respectively. The observed ferroelectricity in bismuth ferrite ceramics owes to the point defects associated with oxygen vacancy defects as well as the smaller size effect.

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4

Basantakumar Sharma, H. "Multiferroic bismuth ferrite thin film and bismuth ferrite-cobalt ferrite nanocomposites." Ferroelectrics 516, no. 1 (August 18, 2017): 90–97. http://dx.doi.org/10.1080/00150193.2017.1362289.

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5

Nazir, Ammara, Shoomaila Latif, Syed Farooq Adil, Mufsir Kuniyil, Muhammad Imran, Mohammad Rafe Hatshan, Farah Kanwal, and Baji Shaik. "Photocatalytic Degradation of Cefixime Trihydrate by Bismuth Ferrite Nanoparticles." Materials 15, no. 1 (December 28, 2021): 213. http://dx.doi.org/10.3390/ma15010213.

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The present work was carried out to synthesize bismuth ferrite (BFO) nanoparticles by combustion synthesis, and to evaluate the photocatalytic activity of synthesized bismuth ferrite nanoparticles against cefixime trihydrate. BFO nanoparticles were successfully synthesized using bismuth (III) nitrate and iron (III) nitrate by a combustion synthesis method employing different types of fuels such as maltose, succinic acid, cinnamic acid, and lactose. The effects of the different types of fuels on the morphology and size of the bismuth ferrite nanoparticles were investigated. Characterization of the as-obtained bismuth ferrite nanoparticles was carried out by different techniques such as X-ray diffraction (XRD), scanning electron microscopy (SEM), Energy-Dispersive Spectroscopy (EDS), N2-sorption analysis, Fourier-transform infrared spectroscopy (FT-IR), and ultraviolet-visible (UV–vis) spectroscopy. Photoluminescence studies were also carried out for the various bismuth ferrite nanoparticles obtained. Degradation of cefixime trihydrate was investigated under sunlight to evaluate the photocatalytic properties of the bismuth ferrite nanoparticles, and it was found that the bismuth ferrite nanoparticles followed first-order degradation kinetics in solar irradiation in the degradation of antibiotic, cefixime trihydrate.

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6

Kannolli, Amrutesh, and P. Avinash. "Physicochemical Investigation of Synthesized Bismuth and Silver-Doped Bismuth Nanoferrites, And Their Dielectric Properties." IOP Conference Series: Materials Science and Engineering 1300, no. 1 (April 1, 2024): 012038. http://dx.doi.org/10.1088/1757-899x/1300/1/012038.

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Abstract Bismuth nano ferrite and silver-doped bismuth nano ferrite are synthesized by the sol-gel method. The synthesized compound is characterized through several characterization methods such as the X-ray diffraction method, Fourier transform infrared spectroscopy (FTIR), Scanning electron microscopy (SEM), and UV-Visible spectral studies. The X-Ray diffraction confirms bismuth nano ferrite has a Rhombohedral structure and belongs to the R-3m space group, and the silver-doped bismuth nano ferrite has an orthorhombic structure and belongs to the Cmcm space group. The crystallite size is calculated through Scherrer’s formula, the bismuth nano ferrite has a crystallite size of 20 nm, and the silver-doped bismuth nano ferrite has a crystallite size of 36.33 nm. FTIR studies confirm the formation of ferrite and indicate the metal ion group observed the peak shift after doping in the fingerprint region. The metal ion peaks are presented at 446.7 cm−1 and 527.8 cm−1 but after doping they shifted to 453 cm−1, 534 cm−1. The UV-Visible spectral analysis identifies the change in the energy band gap through a tauc plot, initially the energy band gap of bismuth nano ferrite is about 2.79 eV but after doping it reduces to 1.61 eV. the surface morphology is determined by SEM analysis and it provides 30 nm and for the doped compound 37 nm average particle size. Dielectric study confirms doping of silver to the bismuth gives more improved results which will be helpful at the application level such as in memory devices, photocatalysis, water splitting, and gas detection.

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7

Irfan, Syed, Guang-xing Liang, Fu Li, Yue-xing Chen, Syed Rizwan, Jingcheng Jin, Zheng Zhuanghao, and Fan Ping. "Effect of Graphene Oxide Nano-Sheets on Structural, Morphological and Photocatalytic Activity of BiFeO3-Based Nanostructures." Nanomaterials 9, no. 9 (September 19, 2019): 1337. http://dx.doi.org/10.3390/nano9091337.

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Photocatalysts are widely used for the elimination of organic contaminants from waste-water and H2 evaluation by water-splitting. Herein, the nanohybrids of lanthanum (La) and selenium (Se) co-doped bismuth ferrites with graphene oxide were synthesized. A structural analysis from X-ray diffraction confirmed the transition of phases from rhombohedral to the distorted orthorhombic. Scanning electron microscopy (SEM) revealed that the graphene nano-sheets homogenously covered La–Se co-doped bismuth ferrites nanoparticles, particularly the (Bi0.92La0.08Fe0.50Se0.50O3–graphene oxide) LBFSe50-G sample. Moreover, the band-gap nanohybrids of La–Se co-doped bismuth ferrites were estimated from diffuse reflectance spectra (DRS), which showed a variation from 1.84 to 2.09 eV, because the lowering of the band-gap can enhance photocatalytic degradation efficiency. Additionally, the photo-degradation efficiencies increased after the incorporation of graphene nano-sheets onto the La–Se co-doped bismuth ferrite. The maximum degradation efficiency of the LBFSe50-G sample was up to 80%, which may have been due to reduced band-gap and availability of enhanced surface area for incoming photons at the surface of the photocatalyst. Furthermore, photoluminescence spectra confirmed that the graphene oxide provided more electron-capturing sites, which decreased the recombination time of the photo-generated charge carriers. Thus, we can propose that the use of nanohybrids of La–Se co-doped bismuth ferrite with graphene oxide nano-sheets is a promising approach for both water-treatment and water-splitting, with better efficiencies of BiFeO3.

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8

Varaprasad, Kokkarachedu, Koduri Ramam, G. Siva Mohan Reddy, and Rotimi Sadiku. "Development and characterization of nano-multifunctional materials for advanced applications." RSC Adv. 4, no. 104 (2014): 60363–70. http://dx.doi.org/10.1039/c4ra09980j.

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9

Sharon, V. S., K. A. Malini, and K. J. Arun. "Synthesis and characterization of bismuth ferrite-barium titanate nano composites." IOP Conference Series: Materials Science and Engineering 1263, no. 1 (October 1, 2022): 012028. http://dx.doi.org/10.1088/1757-899x/1263/1/012028.

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Bismuth ferrite and Strontium doped bismuth ferrite(Bi1-xSrxFeO3(x=0.0,0.3,0.5,0.7) samples are synthesized by the modified sol-gel technique which is a simple and economic technique.Composites of bismuth ferrite and barium titanate in the ratio 2:1 and 1:2 and Bi1-xSrxFeO3 – BaTiO3 (x=0.3,0.5,0.7) with the ratio 2:1 are synthesized by solid-state reaction technique. The formation of composites of bismuth ferrite with rhombohedral structure and space group R3c and barium titanate with tetragonal structure and space group P4mm is identified using XRD. The dielectric and ferroelectric properties of the composites are investigated at room temperature and are reported in this paper.

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10

Chung, Kyong-Hwan, Hyun-Hak Jung, Sun-Jae Kim, Young-Kwon Park, Sang-Chai Kim, and Sang-Chul Jung. "Hydrogen Production through Catalytic Water Splitting Using Liquid-Phase Plasma over Bismuth Ferrite Catalyst." International Journal of Molecular Sciences 22, no. 24 (December 18, 2021): 13591. http://dx.doi.org/10.3390/ijms222413591.

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This study examined the H2 production characteristics from a decomposition reaction using liquid-phase plasma with a bismuth ferrite catalyst. The catalyst was prepared using a sol–gel reaction method. The physicochemical and optical properties of bismuth ferrite were analyzed. H2 production was carried out from a distilled water and aqueous methanol solution by direct irradiation via liquid-phase plasma. The catalyst absorbed visible-light over 610 nm. The measured bandgap of the bismuth ferrite was approximately 2.0 eV. The liquid-phase plasma emitted UV and visible-light simultaneously according to optical emission spectrometry. Bismuth ferrite induced a higher H2 production rate than the TiO2 photocatalyst because it responds to both UV and visible light generated from the liquid-phase plasma.

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11

Liu, Zhifei, Yaqi Tan, Xuefeng Ruan, Jing Guo, Wei Li, Jiajun Li, Hongyu Ma, Rui Xiong, and Jianhong Wei. "Spark Plasma Sintering-Assisted Synthesis of Bi2Fe4O9/Bi25FeO40 Heterostructures with Enhanced Photocatalytic Activity for Removal of Antibiotics." International Journal of Molecular Sciences 23, no. 20 (October 21, 2022): 12652. http://dx.doi.org/10.3390/ijms232012652.

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Bismuth ferrite-based heterojunction composites have been considered as promising visible-light responsive photocatalysts because of their narrow band gap structure; however, the synthetic methods reported in the literature were usually time-consuming. In this study, we report a facile and quick preparation of bismuth ferrite-based composites by the hydrothermal method, combined with spark plasma sintering (SPS), a technique that is usually used for the high-speed consolidation of powders. The result demonstrated that the SPS-assisted synthesized samples possess significant enhanced photoelectric and photocatalytic performance. Specifically, the SPS650 (sintered at the 650 °C for 5 min by SPS) exhibits a 1.5 times enhancement in the photocurrent density and a 3.8 times enhancement in the tetracycline hydrochloride photodegradation activity than the unmodified bismuth ferrite samples. The possible influence factors of SPS on photoelectric and photocatalytic performance of bismuth ferrite-based composites were discussed carefully. This study provides a feasible method for the facile and quick synthesis of a highly active bismuth ferrite-based visible-light-driven photocatalyst for practical applications.

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12

Муслимов, А. Э., А. В. Буташин та В. М. Каневский. "Твердофазная эпитаксия пленок BiFeO-=SUB=-3-=/SUB=- с магнитоэлектрическими свойствами на сапфире". Письма в журнал технической физики 45, № 3 (2019): 37. http://dx.doi.org/10.21883/pjtf.2019.03.47271.17388.

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AbstractThe ferroelectric domain structure has been investigated in bismuth-ferrite rhombohedral phase films prepared on the rhombohedral plane of sapphire by solid-phase epitaxy. The piezoelectric modulus has been estimated to be d _33 ~ 2 pm/V. In films of the Bi_25FeO_39–BiFeO_3 and Bi_2Fe_4O_9–BiFeO_3 systems on sapphire, the magnetoelectric-switching effect has been observed in bismuth ferrite crystallites without deposition of exchange-coupled layers. The values of the magnetic moment in bismuth ferrite microcrystallites have been estimated.

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13

Misiurev, Denis, Pavel Kaspar, and Vladimír Holcman. "Brief Theoretical Overview of Bi-Fe-O Based Thin Films." Materials 15, no. 24 (December 7, 2022): 8719. http://dx.doi.org/10.3390/ma15248719.

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This paper will provide a brief overview of the unique multiferroic material Bismuth ferrite (BFO). Considering that Bismuth ferrite is a unique material which possesses both ferroelectric and magnetic properties at room temperature, the uniqueness of Bismuth ferrite material will be discussed. Fundamental properties of the material including electrical and ferromagnetic properties also will be mentioned in this paper. Electrical properties include characterization of basic parameters considering the electrical resistivity and leakage current. Ferromagnetic properties involve the description of magnetic hysteresis characterization. Bismuth ferrite can be fabricated in a different form. The common forms will be mentioned and include powder, thin films and nanostructures. The most popular method of producing thin films based on BFO materials will be described and compared. Finally, the perspectives and potential applications of the material will be highlighted.

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14

Saputro, D. E., S. Budiawanti, Suharno Wira Sukarsa, D. T. Rahardjo, and B. Purnama. "THE EFFECT OF MODIFY NaOH CONCENTRATION ON THE STRUCTURE AND MAGNETIC PROPERTIES IN CO-PRECIPITATED NANOCRYSTALLINE BISMUTH SUBSTITUTED COBALT FERRITE." Jurnal Teknologi 84, no. 3 (March 31, 2022): 9–15. http://dx.doi.org/10.11113/jurnalteknologi.v84.17137.

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The structural and magnetic properties modification in the bismuth substituted cobalt ferrite nanopowder with various molar concentrations of NaOH has been successfully synthesized by the coprecipitation method. The crystalline structure was measured using X-ray diffraction (XRD), bond groups, and absorption strength was measured by Fourier Transform Infrared spectroscopy (FTIR) studies, and then magnetic properties were measured using a Vibrating Scanning Magnetometer (VSM). The XRD measurement results confirmed that the whole samples of bismuth cobalt ferrite owing single phase of inverse spinel face cubic center (fcc) with space group Fd-3m were obtained for variations in molar concentration of NaOH. The FTIR measurements obtained that the absorption characteristic in the frequency band 400 - 750 cm-1 according to resonance at octahedral and tetrahedral sites of the occurrence metal oxide. The VSM measurement showed that the magnetic properties of bismuth substituted cobalt ferrite available to tune with modifying NaOH concentration in the co-precipitation procedure. Thus, the effect of increasing the concentration of NaOH into bismuth-substituted cobalt ferrite can change the characteristics of the cobalt ferrite such as lattice parameters, shifts in the absorption peaks of functional groups, and changes in magnetic saturation. The significance of this research is to know the exact concentration value of bismuth substituted cobalt ferrite to obtain the best characteristics.

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15

Saputro, D. E., S. Budiawanti, Suharno Wira Sukarsa, D. T. Rahardjo, and B. Purnama. "THE EFFECT OF MODIFY NaOH CONCENTRATION ON THE STRUCTURE AND MAGNETIC PROPERTIES IN CO-PRECIPITATED NANOCRYSTALLINE BISMUTH SUBSTITUTED COBALT FERRITE." Jurnal Teknologi 84, no. 3 (March 31, 2022): 9–15. http://dx.doi.org/10.11113/jurnalteknologi.v84.17137.

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The structural and magnetic properties modification in the bismuth substituted cobalt ferrite nanopowder with various molar concentrations of NaOH has been successfully synthesized by the coprecipitation method. The crystalline structure was measured using X-ray diffraction (XRD), bond groups, and absorption strength was measured by Fourier Transform Infrared spectroscopy (FTIR) studies, and then magnetic properties were measured using a Vibrating Scanning Magnetometer (VSM). The XRD measurement results confirmed that the whole samples of bismuth cobalt ferrite owing single phase of inverse spinel face cubic center (fcc) with space group Fd-3m were obtained for variations in molar concentration of NaOH. The FTIR measurements obtained that the absorption characteristic in the frequency band 400 - 750 cm-1 according to resonance at octahedral and tetrahedral sites of the occurrence metal oxide. The VSM measurement showed that the magnetic properties of bismuth substituted cobalt ferrite available to tune with modifying NaOH concentration in the co-precipitation procedure. Thus, the effect of increasing the concentration of NaOH into bismuth-substituted cobalt ferrite can change the characteristics of the cobalt ferrite such as lattice parameters, shifts in the absorption peaks of functional groups, and changes in magnetic saturation. The significance of this research is to know the exact concentration value of bismuth substituted cobalt ferrite to obtain the best characteristics.

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16

Cai, Wei, Chun Lin Fu, Rong Li Gao, Wei Hai Jiang, Xiao Ling Deng, and Gang Chen. "Ferroelectric and Photovoltaic Properties of Mn-Doped Bismuth Ferrite Thin Films." Materials Science Forum 815 (March 2015): 135–40. http://dx.doi.org/10.4028/www.scientific.net/msf.815.135.

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Bismuth ferrite is an important material in ferroelectric photovoltaic field, because of its narrow band gap and large polarization. Doping is a common method to further improve the photovoltaic properties of bismuth ferrite. Mn-doped bismuth ferrite thin films were prepared by sol-gel method. The effects of manganese on the crystal structure, ferroelectric and photovoltaic properties have been investigated. The result indicates that Mn-doped bismuth ferrite thin films are single phase and the lattice constant increases with the increase of manganese content. As manganese content increases, the remnant polarization and coercive electric field increase, while the short circuit photocurrent density and power conversion efficiency decrease. The open circuit photovoltage increases first and reaches the maximum and then decreases as manganese content increases. The results indicate that enhanced ferroelectricity caused by addition of manganese doesn’t make improvement on the photovoltaic characteristic.

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17

SARDAR, K., K. ALI, S. ALTAF, M. SAJJAD, B. SALEEM, L. AKBAR, A. SATTAR, et al. "ENHANCED STRUCTURAL AND OPTICAL PROPERTIES OF BISMUTH FERRITE (BiFeO3) NANOPARTICLES." Digest Journal of Nanomaterials and Biostructures 15, no. 1 (January 2020): 51–57. http://dx.doi.org/10.15251/djnb.2020.151.51.

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Multiferroic Bismuth Iron Oxide (BiFeO3) nanoparticles was synthesized via sol gel method. This study demonstrated the preparation of nanoparticles of bismuth ferrite at 550ᵒC. In this method Bismuth nitrate [Bi (NO3)3.5H2O] and iron nitrate [Fe (NO3)3.9H2O] were used as starting chemical agent. In order to overcome the volatility of Bismuth at high temperature, different weight percentages of chemicals were used. Citric acid was used as chelating agent. Thermal treatment was given to the samples at 550ᵒC. Bismuth Ferrite nanoparticles showed obvious ferromagnetic properties. The size of Bismuth Ferrite nanoparticles reduced as magnetization increased. As the concentration of chemical increased at 550ᵒC the particle size was reduced due to recrystallization. Sol Gel method helped to control the size of crystals. The characterization of prepared samples of Bismuth Ferrite Nanoparticles was done by using X-ray diffraction (XRD), scanning electron microscope (SEM) and UV- visible for getting the information about surface morphology and crystallographic structure. X-ray diffraction result gave the information about the particle size and phase identification. UV- visible gave the information about the band gap energy of BiFeO3 nanoparticles. Scanning electron microscope result gave the information about surface morphology and grain size of nanoparticles at different resolutions.

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18

Juwita, Erna, Fitria Ayu Sulistiani, Mahardika Yoga Darmawan, Daiki Oshima, Takeshi Kato, and Edi Suharyadi. "Microstructures, Magnetic Properties and Specific Absorption Rate of Polymer-Modified Bismuth Ferrite Nanoparticles." Key Engineering Materials 940 (January 30, 2023): 21–29. http://dx.doi.org/10.4028/p-sc9eqe.

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Bismuth ferrite nanoparticles were successfully synthesized by the co-precipitation method and modified by polyethylene glycol (PEG) 4000. X-ray diffraction patterns showed a sillenite structure of bismuth ferrite (Bi25FeO40) with a crystallite size of 35.0 nm and the new phase appeared after surface modification. The new phase was Bi2Fe4O9. Crystallite size increased after surface modification of nanoparticles with PEG. The highest increase of crystallite size after surface modification with PEG was 40.1 nm. Transmission electron microscopy images showed that samples before and after surface modification were polycrystalline and still agglomerated. Spectra of Fourier transform infrared showed the presence of C-O stretching at 1080 cm-1 and C-H bending vibration at 1342 cm-1 in the bismuth ferrite/PEG sample, which did not appear in bismuth ferrite sample. The magnetic measurement indicated the weak ferromagnetic properties of the samples. Saturation magnetization did not appear after a maximum external magnetic field (15 kOe) was applied. The maximum magnetization of nanoparticles was 0.5 emu/g and tended to decrease to 0.2 emu/g after surface modification with PEG. Optical properties analysis showed a shift in the maximum absorption peak of bismuth ferrite nanoparticles towards a lower wavelength (blue shift) after surface modification of the nanoparticles. The specific absorption rate (SAR) value of nanoparticles increased by increasing an alternating magnetic field (AMF) strength. The SAR values of bismuth ferrite nanoparticles were 48.8, 61.4, and 84.4 mW/g and decreased to 32.0, 45.2, and 83.3 mW/g after surface modification at the AMF strength of 150, 200, and 250 Oe, respectively.

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19

Amaya, S., J. Perez, H. Colorado, A. Echavarria, and F. A. Londoño. "Bismuth ferrite-barium titanate system studies around morphotropic phase boundary." Journal of Physics: Conference Series 2516, no. 1 (May 1, 2023): 012002. http://dx.doi.org/10.1088/1742-6596/2516/1/012002.

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Abstract Nowadays, the electro-electronic industry and scientific community have a great interest in improving memory devices. A candidate is the bismuth ferrite owing to the coexistence of ferroelectricity and anti-ferromagnetism at room temperature, however, a high leakage current harms their ferroelectric properties. Thus, bismuth ferrite and barium titanate solutions improve the ferroelectric properties of bismuth ferrite and optimize the magnetoelectric coupling factor. This system is called multiferroic, materials exhibit the coexistence of ferromagnetic, ferroelectric, or ferro-elastic orders, which is of interest to the scientific physics community and electronic industry. In this paper, bismuth ferrite-barium titanate system around the morphotropic phase boundary was studied and analyzed. It was observed changes in the structural properties in function of barium titanate content. Calcination temperature was determined from thermogravimetric analysis curves to powders of bismuth ferrite-barium titanate system. Ceramic bodies were densified conventionally. Archimedes’ method was used for density measure. Ceramics with densities greater than 95% were obtained. 93% of the perovskite phase was obtained from structural results. Finally, structural properties were presented and analyzed using Mossbauer spectroscopy as complementary technique. These analyses are very important in solid state physics because to contribute to understanding the phenomenology and synthesis process of multiferroic materials.

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20

Maran, Ronald, Shintaro Yasui, Eugene Eliseev, Anna Morozovska, Hiroshi Funakubo, Ichiro Takeuchi, and Nagarajan Valanoor. "Enhancement of Dielectric Properties in Epitaxial Bismuth Ferrite-Bismuth Samarium Ferrite Superlattices." Advanced Electronic Materials 2, no. 8 (July 5, 2016): 1600170. http://dx.doi.org/10.1002/aelm.201600170.

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21

Tayebi, Meysam, Ahmad Tayyebi, Tayyebeh Soltani, and Byeong-Kyu Lee. "pH-Dependent photocatalytic performance of modified bismuth vanadate by bismuth ferrite." New Journal of Chemistry 43, no. 23 (2019): 9106–15. http://dx.doi.org/10.1039/c9nj00214f.

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22

Catur Saputri, Abi, Nurdiyantoro Putra Prasetya, Utari Utari, and Budi Purnama. "Photocatalytic Properties of Co-precipitated Bismuth Cobalt Ferrite." JURNAL ILMU FISIKA | UNIVERSITAS ANDALAS 14, no. 2 (August 30, 2022): 116–23. http://dx.doi.org/10.25077/jif.14.2.116-123.2022.

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Bismuth substituted cobalt ferrite nanoparticle is studied for photocatalytic in this paper. Bismuth cobalt ferrite has been synthesized by the coprecipitation method and low-temperature annealing treatment. The characterization results showed that the XRD spectral pattern is consistent with ICDD 221086. The crystallite size of bismuth cobalt ferrite increases with increasing annealing temperature. FTIR results confirm the available metal-oxide at number wave around 570/cm and 475/cm which is the appearance of octahedral and tetrahedral sites owing cobalt ferrite. The photocatalyst test was carried out by varying the catalyst mass and UV irradiation time. The absorption spectrum decreases with increasing catalyst mass. The increase in UV irradiation time causes the formation of more holes (h+) and electrons (e-). So that the hydroxide reaction occurs that produces free radicals. The results of this study indicate that cobalt ferrite-based nanoparticles have potential as photocatalyst materials.

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23

Nikolaevа, S. A., Yu S. Elkina, E. N. Lysenko, E. V. Nikolaev, and V. A. Vlasov. "Effect of Bismuth Oxide on the Structure, Electrical Resistance and Magnetization of Lithium Zinc Ferrite." Fizika metallov i metallovedenie 125, no. 4 (October 27, 2024): 447–52. http://dx.doi.org/10.31857/s0015323024040092.

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The structural, electrical, and magnetic properties of lithium zinc ferrite prepared by ceramic technology have been studied. The composition of lithium zinc ferrite is Li0.4Fe2.4Zn0.2O4 with 1 and 2 wt % bismuth oxide. The addition of Bi2O3 prior to sintering of the samples has been shown to affect the structural, electrical, and magnetic properties of the ferrite. A significant increase in density from 4.47 to 4.65 g/cm3 and a decrease in porosity from 4.8 to 2.3% have been observed when the concentration of bismuth oxide has been increased to 2 wt %. The Bi2O3-containing samples have higher specific electrical resistivity compared to that of the additive-free lithium zinc ferrite. The introduction of bismuth oxide has reduced the specific saturation magnetization from 70.55 to 54.76 G cm3/g. The Curie temperature has not changed significantly. An optimal combination of macroscopic properties of ferrite has been found at 1 wt % Bi2O3 concentration.

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24

Krasniakova I. O., Sidorenko E. N., Galatova A. O., Rudsky D. I., Glazunova E. V., Kuprina Yu. A., Nazarenko A. V., Kofanova N. B., and Rudskaya A. G. "Features of the structure, microstructure, radio-emitting and radio-absorbing properties of mechanically and non-mechanically activated BiFeO-=SUB=-3-=/SUB=- ceramics." Physics of the Solid State 65, no. 4 (2023): 537. http://dx.doi.org/10.21883/pss.2023.04.55992.560.

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By the method of the two-stage solid-phase synthesis from a stoichiometric mixture of the bismuth and iron oxides, mechanically and non-mechanically activated samples of bismuth ferrite ceramics were prepared. The phase composition of the ceramic samples is predominantly BiFeO3, while Bi25FeO40 and Bi2Fe4O9 are recorded in minor amounts, the proportion of the latter decreases due to mechanical activation. Mechanical processing of the samples expands the range of linear sizes of microparticles. It has been established that mechanically activated bismuth ferrite ceramics absorb electromagnetic microwave energy up to -16 dB, while the samples of the original material absorb up to -25 dB. Both ceramic samples are capable of emitting a weak electromagnetic field, which decreases with increasing height above the sample. Keywords: bismuth ferrite BiFeO3, solid-phase synthesis, mechanical activation, structure, microstructure, radio absorption and radio emission.

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25

Buryanenko I. V., Semenov V. G., Lomanova N. A., Osipov A. V., Volkov M. P., and Pleshakov I. V. "Magnetic properties of nanocrystalline material based on Bi-=SUB=-2-=/SUB=-Fe-=SUB=-4-=/SUB=-O-=SUB=-9-=/SUB=-." Physics of the Solid State 64, no. 5 (2022): 539. http://dx.doi.org/10.21883/pss.2022.05.53513.274.

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The magnetic characteristics of a nanocrystalline material based on bismuth ferrite Bi2Fe4O9 with 60±3 nm crystallites were studied. The obtained material demonstrates unusual magnetic properties, which are manifested in a significant increase in the value of magnetization in comparison with the data known from other works. Keywords: nanocrystals, bismuth ferrite, mullite, magnetic properties.

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26

Misiurev, Denis, Pavel Kaspar, Dinara Sobola, Nikola Papež, Saleh Hekmat Fawaeer, and Vladimír Holcman. "Exploring the Piezoelectric Properties of Bismuth Ferrite Thin Films Using Piezoelectric Force Microscopy: A Case Study." Materials 16, no. 8 (April 18, 2023): 3203. http://dx.doi.org/10.3390/ma16083203.

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Over recent decades, the scientific community has managed to make great progress in the theoretical investigation and practical characterization of bismuth ferrite thin films. However, there is still much work to be completed in the field of magnetic property analysis. Under a normal operational temperature, the ferroelectric properties of bismuth ferrite could overcome the magnetic properties due to the robustness of ferroelectric alignment. Therefore, investigation of the ferroelectric domain structure is crucial for functionality of any potential devices. This paper reports deposition and analyzation of bismuth ferrite thin films by Piezoresponse Force Microscopy (PFM) and XPS methods, aiming to provide a characterization of deposited thin films. In this paper, thin films of 100 nm thick bismuth ferrite material were prepared by pulsed laser deposition on multilayer substrates Pt/Ti(TiO2)/Si. Our main purpose for the PFM investigation in this paper is to determine which magnetic pattern will be observed on Pt/Ti/Si and Pt/TiO2/Si multilayer substrates under certain deposition parameters by utilizing the PLD method and using samples of a deposited thickness of 100 nm. It was also important to determine how strong the measured piezoelectric response will be, considering parameters mentioned previously. By establishing a clear understanding of how prepared thin films react on various biases, we have provided a foundation for future research involving the formation of piezoelectric grains, thickness-dependent domain wall formations, and the effect of the substrate topology on the magnetic properties of bismuth ferrite films.

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27

Митаров, Р. Г., С. Н. Каллаев, А. М. Бакмаев, С. А. Резниченко та А. Т. Темиров. "Рассеяние фононов на парамагнитных ионах европия и самария в феррите висмута". Физика твердого тела 62, № 7 (2020): 1137. http://dx.doi.org/10.21883/ftt.2020.07.49487.034.

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The temperature dependence of the thermal diffusivity and thermal conductivity of the multiferroics BiFeO3, Bi0.90Sm0.10FeO3 and Bi0.90Еu0.10FeO3 is studied. It was found that the substitution of bismuth ions by the rare-earth europium and samarium ions in bismuth ferrite leads to a decrease in phonon thermal conductivity in a wide temperature range. It was established that the decrease in the thermal conductivity of bismuth ferrite is due to resonance scattering of phonons at paramagnetic levels of europium and samarium ions.

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Budi, M. A. K., E. B. Glass, N. G. Rudawski, and J. S. Andrew. "Exchange bias in bismuth ferrite/cobalt ferrite Janus nanofibers." Journal of Materials Chemistry C 5, no. 33 (2017): 8586–92. http://dx.doi.org/10.1039/c7tc00975e.

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Bismuth ferrite:cobalt ferrite (BiFeO₃:CoFe₂O₄) nanofibers with tailorable exchange bias effects were synthesized utilizing a Janus type morphology, wherein both phases are coupled longitudinally along the length of each fiber.

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29

S.M. Yahaya, N. Abdu, I.A. Aliyu, and B. Mukhtar. "Nanostructured materials in agriculture: The influence of bismuth ferrite and graphitic carbon nitride on maize growth performances in Samaru, Nigeria." Journal of Agriculture and Environment 19, no. 2 (February 13, 2024): 237–53. http://dx.doi.org/10.4314/jagrenv.v19i2.22.

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This study explores the application of nanostructured materials, specifically metal-free graphitic carbon nitride (g-C3N4), bismuth ferrite (BiFeO3), magnesium-doped bismuth ferrite (Bi0.7Mg0.3FeO3), and a heterojunction of g-C3N4 and bismuth ferrite (g-C3N4/BiFeO3), in influencing maize growth and performances in Samaru, Nigeria. The study involves the synthesis and characterization of these nanostructured materials, confirming their structural integrity and stability for photocatalytic applications. The greenhouse experiment employs a range of treatments, including a control (no fertilization), +P +K inorganic fertilizer, the recommended farmer's fertilizer rate (120:60:60), and varied levels of the synthesized nanostructured materials (1 g, 2 g and 3 g). The experiment was laid out in a completely randomized design, and maize (SAMMAZ 15) was used as test crop. Graphitic carbon nitride consistently exhibits the highest plant height, while the recommended rate and magnesium-doped bismuth ferrite exceled in stem girth. Root dry weight was significantly higher in the recommended rate and bismuth ferrite treatments, emphasizing their positive influence on root development. Similar trends were observed in shoot dry weight, with the recommended rate outperforming other treatments. Moreover, the study highlights the importance of treatment levels, identifying level 2 (2 g) as optimal for improved maize performance, aligning with the recommended rate of traditional fertilizer application. While nanostructured materials showed promising performances compared to the control, their impact on growth is comparable to conventional fertilizers. This research provides valuable insights into the potential of nanostructured materials in promoting maize growth, emphasizing the need for further exploration of their mechanisms and optimal application levels in agricultural practices.

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Kostishin, V. G., R. M. Vergazov, S. B. Menshova, I. M. Isaev, and A. V. Timofeev. "The effect of alloying additives on the magnetic permeability and permittivity of ferrite spinel." Industrial laboratory. Diagnostics of materials 87, no. 1 (January 19, 2021): 30–34. http://dx.doi.org/10.26896/1028-6861-2021-87-1-30-34.

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Coatings made of the materials that effectively absorb radiation, e.g., ferrite materials, are used to reduce the level of electromagnetic radiation in rooms containing household or industrial equipment. It is known that significant dissipation of the radiation energy is provided by the thickness of the shielding coating which should be comparable to the length of the electromagnetic wave in the material which, in turn, significantly decreases at high values of the magnetic permeability and permittivity of the radio-absorbing material. Ferrite radio-absorbing coatings are characterized by the high heat resistance, low flammability and small (10 – 20 mm) thickness. However, at frequencies less than 40 MHz, plates with a thickness of more than 30 mm are to be used to provide the effective absorption, and the weight and cost of the coatings increase significantly. The results of studying the effect of the sintering temperature and micro-additives of titanium, calcium and bismuth oxides on the dielectric constant of Ni- and Mn-Zn radio-absorbing ferrites are presented. Reactively pure starting oxide components with a basic substance content of more than 99.6 % wt. were used to synthesize samples using traditional oxide technology. It is shown that alloying with bismuth and titanium oxides is rather effective for obtaining radio-absorbing ferrites with a combination of high values of the magnetic permeability and dielectric permittivity. The obtained results can be used in production of ferrite radio- absorbing materials operating in the megahertz range.

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31

Rajaee, Azimeh, Shi Wang, and Lingyun Zhao. "Bismuth-based nanoparticles as radiosensitizer in low and high dose rate brachytherapy." Polish Journal of Medical Physics and Engineering 25, no. 2 (June 1, 2019): 79–85. http://dx.doi.org/10.2478/pjmpe-2019-0011.

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Abstract Background: Recently bismuth-based nanoparticles have attracted increasing attention as a dose amplification agent in radiation therapy due to high atomic number, high photoelectric absorption, low cost, and low toxicity. Objectives: This study aims to calculate physical aspects of dose enhancement of bismuth-based nanoparticles in the presence of brachytherapy source by Monte Carlo simulation and an analytical method for low mono-energy. Materials and methods: After simulation and validation brachytherapy sources (Iodine-125 and Ytterbium-169) by Monte Carlo code, bismuth-based nanoparticles (bismuth, bismuth oxide, bismuth sulfide, and bismuth ferrite) were modeled in the sizes of 50 nm and 100 nm for two concentrations of 10 and 20 mg/ml. Dose enhancement factors for the bismuth-based nanoparticles were measured at both brachytherapy sources. Furthermore, the dose amplification was calculated with an analytic method at 30 keV mono-energy. Results: Dose enhancement factor was greatest with pure bismuth nanoparticles, followed by bismuth oxide, bismuth sulfide and bismuth ferrite for both radiation source and simulation methods. The dose amplification for the bismuth-based nanoparticles increased with increasing size and concentration of nanoparticles. Conclusion: The physical aspect dose enhancement of the nanoparticles was shown by Monte Carlo and analytic method. The results have proved bismuth-based nanoparticles deserve further study as a radiosensitizer.

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32

Дыбов, В. А., Ю. Е. Калинин, А. А. Камынин, М. А. Каширин, В. А. Макагонов, А. Е. Никонов, Д. В. Сериков та А. В. Ситников. "Электрические и оптические свойства тонкопленочного феррита висмута". Журнал технической физики 92, № 12 (2022): 1951. http://dx.doi.org/10.21883/jtf.2022.12.53762.182-22.

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The optical and electrical properties of bismuth ferrite thin films obtained by high-frequency magnetron sputtering in an atmosphere of argon and oxygen (80% + 20%) has been studied. Investigations of the optical properties have shown that for polycrystalline bismuth ferrite films the optical band gap is ~3 eV, which is in the range of given in the literature values. The dependences of the specific electrical conductivity on the magnitude of the electric field has been studied for the synthesized films. It has been established that the electrical conductivity does not depend on the electric field strength up to the value of E = 2.1106 V/m. The experimental results are discussed in terms of the model of charge carrier injection from aluminum electrode into the conduction band of bismuth ferrite.

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33

Dkhil, B. "Bismuth ferrite,a revolutionary material." L"Edition of Universite Paris-Saclay, Iss. 03, January (2016): 12–13.

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34

Scott, J. F. "Magnetic phases of bismuth ferrite." Journal of Magnetism and Magnetic Materials 321, no. 11 (June 2009): 1689–91. http://dx.doi.org/10.1016/j.jmmm.2009.02.019.

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35

Wu, Jiagang, Binyu Zhang, and Xiaopeng Wang. "Bismuth ferrite composite thin films." Applied Physics A 111, no. 4 (March 30, 2013): 1017–20. http://dx.doi.org/10.1007/s00339-013-7686-3.

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36

Marinkovic-Stanojevica, Z., L. Mancic, T. Sreckovic, and B. Stojanovic. "Mechanochemical synthesis of bismuth ferrite." Journal of Mining and Metallurgy, Section B: Metallurgy 49, no. 1 (2013): 27–31. http://dx.doi.org/10.2298/jmmb120430039m.

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A powder mixture of Bi2O3 and Fe2O3 was mechanically treated in a planetary ball mill in an air from 30 to 720 minutes. It was shown that the mechanochemical formation of BiFeO3 (BFO) phase was initiated after 60 min and its amount increased gradually with increasing milling time. A detailed XRPD structural analysis is realized by Rietveld?s structure refinement method. The resulting lattice parameters, relative phase abundances, crystallite sizes and crystal lattice microstrains were determined as a function of milling time. Microstructural analysis showed a little difference in morphology of obtained powders. The primary particles, irregular in shape and smaller than 400 nm are observed clearly, although they have assembled together to form agglomerates with varying size and morphology. Dense BFO ceramics were prepared by conventional solid-state reaction at the temperature of 810?C for 1h followed immediately by quenching process. [Projekat Ministarstva nauke Republike Srbije, br. III45007: Zero- to Three-Dimensional Nanostructures for Application in Electronics and Renewable Energy Sources: Synthesis, Characterization and Processing

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37

Zvezdin, Anatoly K., and Alexander P. Pyatakov. "Flexomagnetoelectric effect in bismuth ferrite." physica status solidi (b) 246, no. 8 (June 12, 2009): 1956–60. http://dx.doi.org/10.1002/pssb.200945214.

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38

Dybov V.A., Kalinin Yu. E., Kamynin A. A., Kashirin M. A., Makagonov V.A., Nikonov A. E., Serikov D. V., and Sitnikov A.V. "Electrical and optical properties of thin-film bismuth ferrite." Technical Physics 67, no. 12 (2022): 1702. http://dx.doi.org/10.21883/tp.2022.12.55208.182-22.

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Анотація:

The optical and electrical properties of bismuth ferrite thin films obtained by high-frequency magnetron sputtering in an atmosphere of argon and oxygen (80%+20%) has been studied. Investigations of the optical properties have shown that for polycrystalline bismuth ferrite films the optical band gap is ~2.3 eV, which is in the range of given in the literature values. The dependences of the specific electrical conductivity on the magnitude of the electric field has been studied for the synthesized films. It has been established that the electrical conductivity does not depend on the electric field strength up to the value of E=2.1·106 V/m. The experimental results are discussed in terms of the model of charge carrier injection from aluminum electrode into the conduction band of bismuth ferrite. Keywords: electrical conductivity, strong electric fields, optical absorption coefficient, memristor effect.

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39

Surzhikov, A. P. "TUDY OF THE INITIAL MAGNETIC PERMEABILITY OF LiTiZnMnFERRITES OBTAINED BY LIQUID-PHASE SINTERING UNDER RADIATION-THERMAL AND THERMAL CONDITIONS." Eurasian Physical Technical Journal 20, no. 1(43) (March 20, 2023): 12–19. http://dx.doi.org/10.31489/2023no1/12-19.

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The measuring the temperature dependence of the initial permeability was used to study the features of phase and structural transformations in lithium-titanium ferrites as a function of time, heating and cooling rates, and the temperature of liquid-phase sintering under thermal and radiation-thermal heating. Ferrite was synthesized from powder mixture by solid-phase synthesis. A low-melting additive bismuth dioxide was used to obtain the ferrite ceramics by liquid-phase sintering. RT sintering was carried out by heating the samples with a pulsed (1.5–2.0) MeV electron beam. It was established that the additive leads to a less defective state of sintered ferrites, while the action of radiation enhances this effect in the early stages of sintering. The regularities of the influence of the heating and cooling rates of compacted samples on the change in the initial magnetic permeability of sintered ferrites are established.

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40

Halder, Monalisa, Jinia Datta, Raja Mallick, Ranjita Sinha, Khusi Smriti, Chandan Kumar Raul, Shubhadip Atta, and Ajit Kumar Meikap. "Observation of Electrical, Dielectric and Magneto-dielectric Properties of Terbium Doped Bismuth Ferrite Nanoparticles above Room Temperature." International Journal of Innovative Research in Physics 3, no. 4 (July 4, 2022): 20–24. http://dx.doi.org/10.15864/ijiip.3403.

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The effect of rare earth transition metal (Tb) ions doping in A site of bismuth ferrite (BFO) nanoparticles are studied from electrical, dielectric and magneto-dielectric aspects. A detailed study on dielectric properties of the Tb doped bismuth ferrite nanoparticles is done over a wide temperature range in a frequency range of 20 Hz - 2 MHz. Observation on magneto-dielectric response of the sample is done at room temperature upon applying external transverse magnetic field.

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41

Owolabi, Taoreed O., and Mohd Amiruddin Abd Rahman. "Energy Band Gap Modeling of Doped Bismuth Ferrite Multifunctional Material Using Gravitational Search Algorithm Optimized Support Vector Regression." Crystals 11, no. 3 (February 28, 2021): 246. http://dx.doi.org/10.3390/cryst11030246.

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Bismuth ferrite (BiFeO3) is a promising multiferroic and multifunctional inorganic chemical compound with many fascinating application potentials in sensors, photo-catalysis, optical devices, spintronics, and information storage, among others. This class of material has special advantages in the photocatalytic field due to its narrow energy band gap as well as the possibility of the internal polarization suppression of the electron-hole recombination rate. However, the narrow light absorption range, which results in a low degradation efficiency, limits the practical application of the compound. Experimental chemical doping through which the energy band gap of bismuth ferrite compound is tailored to the desired value suitable for a particular application is frequently accompanied by the lattice distortion of the rhombohedral crystal structure. The energy band gap of doped bismuth ferrite is modeled in this contribution through the fusion of a support vector regression (SVR) algorithm with a gravitational search algorithm (GSA) using crystal lattice distortion as a predictor. The proposed hybrid gravitational search based support vector regression HGS-SVR model was evaluated by its mean squared error (MSE), correlation coefficient (CC), and root mean square error (RMSE). The proposed HGS-SVR has an estimation capacity with an up to 98.06% accuracy, as obtained from the correlation coefficient on the testing dataset. The proposed hybrid model has a low MSE and RMSE of 0.0092 ev and 0.0958 ev, respectively. The hybridized algorithm further models the impact of several doping materials on the energy band gap of bismuth ferrite, and the predicted energy gaps are in excellent agreement with the measured values. The precision and robustness exhibited by the developed model substantiate its significance in predicting the energy band gap of doped bismuth ferrite at a relatively low cost while the experimental stress is circumvented.

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42

Saputro, Didik Eko, Utari Utari, and Budi Purnama. "Effect of bismuth substitution on magnetic properties of CoFe2O3 nanoparticles: Study of synthesize using coprecipitation method." Journal of Physics: Theories and Applications 3, no. 1 (March 29, 2019): 9. http://dx.doi.org/10.20961/jphystheor-appl.v3i1.31764.

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Abstract: The effect of bismuth ion substitution on the magnetic properties of cobalt ferrite nanoparticles was identified in this study. This method used in this study was coprecipitation method using 0.1 bismuth ion concentration. The results on hysteresis loop showed that the saturation magnetization of cobalt ferrite nanoparticles decreased with the substitution of bismuth ions, but the coercive field experienced the opposite. Saturation magnetization decreased from 57.97 to 51.19 emu / g, while coercive fields increased from 0.64 to 0.84 kOe.

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43

Mukherjee, S. "Synthesis and Characterization of Bismuth Ferrite-Nickel Ferrite Nanocomposites." Interceram - International Ceramic Review 68, no. 5 (July 2019): 42–51. http://dx.doi.org/10.1007/s42411-019-0021-z.

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44

Jain, Prachi, O. P. Thakur, and S. Shankar Subramanian. "Structural, Dielectric and Impedance Phenomena in Copper Ferrite Nano Powders for Hydroelectric Cell Application." Materials Science Forum 1099 (October 5, 2023): 157–62. http://dx.doi.org/10.4028/p-4ou996.

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Multiferroic materials have become the new era of research because it exhibits the presence of more than two ferroic orderings in its same phase. The pure copper ferrite nano powders have been prepared using sol-gel auto combustion method. The particle size is found to be near about 30-40 nm. Pure copper ferrite nanoparticles have been chosen to prepare because of its improved dielectric and structural properties. The sharpened peaks obtained from the XRD diffraction pattern confirms the crystalline nature of the sample. The structural and impedance studies of pure copper ferrites has also been reported. The SEM analysis confirms the formation of nanoparticles by revealing the value of grain size in nanometer range. The dielectric studies exhibit the Maxwell Wagner polarization and impedance spectroscopy confirms the contribution in conductivity from both grains and grain boundaries at room temperature. The fabrication of hydroelectric cell having area=0.75 cm2 has been done using pure copper ferrite nanoparticles which have shown improved value of current in wet state as compared to other ferrites like cobalt ferrites and bismuth ferrites. These all properties are responsible for improving the structural stability and thus this material can be suggested for fabricating the hydroelectric cells.

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45

Fu, Chun Lin, Wei Cai, Ze Bin Lin, and Wei Hai Jiang. "Photovoltaic Effects of Bismuth Ferrite and Nd-Doped Barium Titanate Thin Films Prepared by Sol-Gel Method." Materials Science Forum 787 (April 2014): 347–51. http://dx.doi.org/10.4028/www.scientific.net/msf.787.347.

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Ferroelectric is a great potential material as new solar cells, light driver and optical sensor because of its anomalous photovoltaic effect. Bismuth ferrite and Nd-doped barium titanate thin films were prepared via sol–gel spin-coating method in the present study. The experimental results show that substitution of Nd3+ ions for Ba2+ on A sites leads to the decrease of band gap, and the short circuit photocurrent density, open circuit photovoltage and power conversion efficiency of Nd-doped barium titanate thin films begin to increase and reach the maximum and then decrease as Nd content increases. It has been found that the band gap of bismuth ferrite thin films annealed at 550–650oC was between 2.306 eV and 2.453 eV. The short circuit photocurrent density decreased with the rise of annealing temperature, and the open circuit photovoltage and the power conversion efficiency of bismuth ferrite thin films annealed at 550oC were higher than the thin films annealed at higher temperature.

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46

Deepak Sharma, A., and H. Basantakumar Sharma. "Influence of sintering temperature on structural, morphological and optical properties of nanocrystalline bismuth ferrite thin films via sol-gel processing." IOP Conference Series: Materials Science and Engineering 1219, no. 1 (January 1, 2022): 012052. http://dx.doi.org/10.1088/1757-899x/1219/1/012052.

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Abstract Nanocrystalline thin films of pure bismuth ferrite were synthesized by sol-gel deposition technique on the corning glass substrate. The influence of sintering temperature on microstructure, morphology, and optical parameters has been systematicallystudied. Optimization of sintering temperature for single-phase nanocrystalline bismuth ferrite fabrication was carried out and found to be at 550 °C. X-ray diffraction confirms the presenceof distortedrhombohedral perovskite structure of bismuth ferrite oriented along (hkl) plane of (101).Surface morphology and Root mean square (RMS) surface roughness of the thin films prepared were determined from the micrographs of atomic force microscopy (AFM).Several optical constants viz. bandgap energy, extinction coefficient,Urbach energy, has been determined using Ultraviolet-Visible spectroscopy of the thin films within the range 200 -800 nm. With the increase in sintering temperature, there is a decrease in the optical bandgap of the material which would be essential for the wide range of applications in thin-film solar cells along with optoelectronic devices.

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47

Краснякова, И. О., Е. Н. Сидоренко, А. О. Галатова, Д. И. Рудский, Е. В. Глазунова, Ю. А. Куприна, А. В. Назаренко, Н. Б. Кофанова та А. Г. Рудская. "Особенности структуры, микроструктуры, радиоизлучающих и радиопоглощающих свойств механоактивированной и немеханоактивированной керамики BiFeO-=SUB=-3-=/SUB=-". Физика твердого тела 65, № 4 (2023): 551. http://dx.doi.org/10.21883/ftt.2023.04.55290.560.

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By the method of the two-stage solid-phase synthesis from a stoichiometric mixture of the bismuth and iron oxides, mechanically and non-mechanically activated samples of bismuth ferrite ceramics were prepared. The phase composition of the ceramic samples is predominantly BiFeO3, while Bi25FeO40 and Bi2Fe4O9 are recorded in minor amounts, the proportion of the latter decreases due to mechanical activation. Mechanical processing of the samples expands the range of linear sizes of microparticles. It has been established that mechanically activated bismuth ferrite ceramics absorb electromagnetic microwave energy up to -16 dB, while the samples of the original material absorb up to -25 dB. Both ceramic samples are capable of emitting a weak electromagnetic field, which decreases with increasing height above the sample.

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48

Miller, A. I., A. A. Gusev, I. A. Verbenko, L. A. Shilkina, and L. A. Reznichenko. "Properties of mechanically activated bismuth ferrite." Bulletin of the Russian Academy of Sciences: Physics 76, no. 7 (July 2012): 798–800. http://dx.doi.org/10.3103/s1062873812070258.

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Kallaev, S. N., Z. M. Omarov, D. K. Palchaev, M. Kh Rabadanov, Zh Kh Murlieva, M. P. Faradzheva, and S. A. Sadykov. "Heat capacity of nanocrystalline bismuth ferrite." High Temperature 53, no. 4 (July 2015): 601–4. http://dx.doi.org/10.1134/s0018151x1504015x.

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50

Morelli, Alessio, Florian Johann, Stuart R. Burns, Alan Douglas, and J. Marty Gregg. "Deterministic Switching in Bismuth Ferrite Nanoislands." Nano Letters 16, no. 8 (July 25, 2016): 5228–34. http://dx.doi.org/10.1021/acs.nanolett.6b02311.

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