Готові списки джерел за темами / Ferrite de Bismuth

Добірка наукової літератури з теми "Ferrite de Bismuth"

Автор: Grafiati
Опубліковано: 12 січня 2023

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Статті в журналах з теми "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.
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.
3

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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4

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.
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.
6

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.
7

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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8

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.
9

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.
10

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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Статті в журналах Дисертації

Дисертації з теми "Ferrite de Bismuth":

1

Moniz, S. J. A. "Growth of bismuth oxide and bismuth ferrite thin films via CVD." Thesis, University College London (University of London), 2012. http://discovery.ucl.ac.uk/1370616/.

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This thesis describes the growth of bismuth oxide (Bi2O3) and multiferroic bismuth ferrite (BiFeO3) films via chemical vapour deposition (CVD). The synthesis of a range of bismuth(III) β-diketonate complexes was carried out via a ligand-exchange reaction between [Bi(N(SiMe3)2)3] and the respective free ligand, and crystal structures of [Bi(dbm)3]2 and [Bi(acac)3] are reported. The decomposition of these complexes was studied via DSC-TGA to assess their potential as single-source precursors to Bi2O3, and the mass transport characteristics of the volatile complexes [Bi(mmp)3], [Bi(thd)3] and [Bi(OtBu)3] were studied. Bi2O3 films were grown via the LPCVD reaction of the single-source precursor [Bi(OtBu)3]; the crystalline phase (and band-gap) of the resultant films depended strongly upon the reactor conditions. Films were tested for photo-oxidation of water under UV-light, revealing high activities comparable to those of TiO2 films described previously. [Bi(dbm)3]2 was utilised as a single-source precursor to β-Bi2O3 films via AACVD, together with the growth of Pt(0) films using H2PtCl6.6H2O as a precursor. Pt-nanoparticle Bi2O3 films were grown via a ‘one-pot’ AACVD reaction of both precursors; composite Pt-Bi2O3 films were able to evolve hydrogen via the photo-reduction of water, a property not observed for films containing either Pt or Bi2O3 alone. BiFeO3 films were grown via a multi-source LPCVD reaction between [Fe(acac)3], [Bi(OtBu)3] and air, as well as via the dual-source reaction of [Bi(OtBu)3] and [Fe(OtBu)3]2 without oxidising gas, and, furthermore, via the single-source precursor [{Cp(CO)2Fe}BiCl2] using AACVD. Magnetometry revealed low temperature ferromagnetism and spin-glass behaviour, characteristic of larger particle sizes. Ferroelectric measurements revealed low polarisation but nevertheless indicated films were multiferroic at room temperature. A selection of these films were tested for photo-oxidation of water under visible-light; films displayed high photoactivities with rates in excess of those from optimised TiO2 films measured under UV-light, highlighting the potential of BiFeO3 films as strong visible-light active photocatalysts.
2

Hatling, Oddmund. "Multiferroic, Magnetoelectric Nanoparticles : Lanthanum-substituted Bismuth Ferrite." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for materialteknologi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-16315.

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In this report, 10 at% lanthanum was introduced to the perovskite structure of bismuth ferrite at the expense of bismuth through a modified Pechini wet chemical method. Green body powders were calcined at several temperatures, and the lattice parameters for each size were found by Rietveld refinement of X-ray powder diffraction data. The parameters displayed strong size-dependent properties, and the rhombohedral distortion from the cubic structure was reduced by decreased particle size. With decreasing crystallite size, the Néel temperature decreased and the cooperative cationic displacement (s - t) showed size dependence at crystallite sizes below 30 nm. A size-dependency was also observed in the Curie temperature.
3

Liu, Yuhang. "First Principle Study of Multiferroic Bismuth Ferrite." Thesis, Uppsala universitet, Materialteori, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-364857.

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4

Skiadopoulou, Styliani. "Multiferroic behaviour of bismuth ferrite porous thin films." Master's thesis, Universidade de Aveiro, 2013. http://hdl.handle.net/10773/11829.

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Mestrado em Engenharia de Materiais
An enormous contribution in the scientific community of material engineering is being made by the exceptionally rapid evolution of the field of multifunctional materials. Multiferroics combine simultaneously at least two of the three ferroic properties: ferroelectricity, ferromagnetism and ferroelasticity. Magnetoelectric multiferroics’ ability of magnetic field manipulation via electric fields or vice versa can be extremely promising for information storage applications, leading to thinner, as well as flexible devices, with significantly high energetic efficiencies and elevated capacities. The aim of this work is the preparation and characterization of bismuth ferrite porous thin films, having as further objective to be able to serve as matrices for future functionalization. The strategy of this work consists of: a) dense film preparation with varying deposition velocities, b) porous film preparation with varying solution template quantities, inorganic precursor concentration and deposition velocities. Annealing temperature studies were also required, for the obtainment of the desired properties and control of microstructure. The methodologies for the film preparation in use were: a) sol-gel process, b) Evaporation Induced Self-Assembly (EISA), for the induction of porosity, and c) dip-coating technique. A series of dense films with varying deposition velocities were produced, serving as means of comparison for the porous thin films. Increasing the sol-gel deposition velocity led to increasing thickness. Piezoresponse Force Microscopy (PFM) characterization was conducted, revealing the expected ferroelectric domains. By the same technique, local piezoelectric hysteresis loops were obtained, showing increase of polarization saturation with increasing thickness. Lastly, magnetic moment measurements were carried out by the use of Superconducting Quantum Interference Device (SQUID), presenting decrease of remnant magnetization with increasing thickness. Varying template concentration was introduced in order to obtain a homogenous porous network. Homogeneity and lack of cracks in the films were successfully achieved, by decreasing solution template mass, for a given solution concentration. Thermal treatment studies revealed loss of porous network ordering at elevated annealing temperatures, required for the obtainment of crystallization and enhanced multiferroic properties. Local piezoelectric hysteresis loops showed increase of the effective piezoelectric coefficient with increasing thickness. SQUID characterization presented increasing remnant magnetization with increasing porosity. Lastly, increasing inorganic precursors concentration resulted in better control of porosity order and increase in the piezoelectric coefficient.
Uma enorme contribuição na comunidade científica da Engenharia de Materiais tem sido feita pela evolução excecionalmente rápida no âmbito dos materiais multifuncionais. Os multiferróicos combinam simultaneamente pelo menos duas das três propriedades ferróicas: ferroeletricidade, ferromagnetismo e ferroelasticidade. Os multiferróicos magnetoelétricos que permitem a manipulação do campo magnético através do campo elétrico e vice versa são extremamente promissores para aplicações de armazenamento de informação, levando a dispositivos mais finos e flexíveis com eficiência energética significativamente mais alta e elevadas capacidades. O objetivo deste trabalho é a preparação e caracterização de filmes porosos de ferrite de bismuto, com vista a serem capazes a uma futura funcionalização. A estratégia deste trabalho consiste: a) preparação de filme denso variando a velocidade de deposição, b) preparação de filme poroso variando o template da solução concentração do precursor inorgânico, e velocidades de deposição. Os estudos sobre temperatura de calcinação são também necessários, para a obtenção das propriedades requeridas e o controlo da microestrutura. As metodologias para a preparação dos filmes foram: a) sol-gel, b) Evaporation Induced Self-Assembly, para a indução da porosidade, e c) dip-coating. Foi preparada uma série de filmes densos variando a velocidade de deposição, servindo como meio de comparação para os filmes porosos. Aumento da velocidade de deposição resulta em aumento da espessura dos filmes. Foi utilizada a caracterização por piezoresponse force microscopy (PFM), revelando domínios ferroelétricos como esperado. Pela mesma técnica, foram obtidas curvas de histerese piezoelétricas locais mostrando o aumento da saturação da polarização com o aumento da espessura. Por fim, as medidas dos momentos magnéticos foram obtidos através do Superconducting Quantum Interference Device (SQUID), apresentando uma diminuição da magnetização remanescente com o aumento da espessura. A variação da concentração do template foi introduzida de modo a obter uma porosidade homogénea. A homogeneidade e ausência de fissuras nos filmes foi conseguida com sucesso pela diminuição da massa do template da solução, para uma determinada concentração da solução. Os estudos do tratamento térmico revelou a perda da porosidade ordenada para temperaturas mais elevadas, necessárias para a obtenção da cristalização e melhoria das propriedades multiferróicas. As curvas de histerese piezoelétrica local mostraram um aumento do coeficiente efetivo piezoelétrico com o aumento da espessura. A caracterização por SQUID apresentou um aumento da magnetização remanescente com o aumento da porosidade. Por fim, o aumento da concentração dos precursores inorgânicos resulta em um melhor controlo da ordem da porosidade e aumento do coeficiente piezoelétrico.
5

Palizdar, Meghdad. "Preparation and characterization of textured bismuth ferrite based ceramics." Thesis, University of Leeds, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.590464.

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There are many reports in the literature describing the effect of texture on the magnetic and electric properties of materials. Texture is used to provide an enhancement in various properties, compared to random orientation, for example an increase in piezoelectric coefficient, or remnant magnetization. In this work, molten salt and tape casting techniques were employed to synthesis textured bismuth ferrite based ceramics. The fabrication of highly-oriented polycrystalJine ceramics of Bi5Feo.SCOo.5 Ti JOl5 (BFCT), prepared via molten salt synthesis and uniaxial pressing of high aspect ratio platelets is reported. Electron backscatter images show a secondary phase within the ceramic which is rich in cobalt and iron. The concentration of the secondary phase obtained from scanning electron microscopy was estimated at < 2 % by volume, below the detection limit of X-ray diffraction. By fabricating textured BFCf, it can be shown that the observed ferromagnetic response is dominated by the secondary phase; although the material is textured, the magnetic response is anisotropic, proving that the BFCT matrix is not ferromagnetic. The templated grain growth techniq ue was used to synthesis textured 60BiFeO-40PbTiO or 60:40BFPT. Both Aurivillius templates (Bi4 Ti30 12 and PbBi4Ti40) and perovskite templates (BaTiO), SrTi03 and 0.4(NaI2BiIl2)Ti03-0.6PbTi03) were used to prepare 60:40BFPT. Only BaTiO) templates were successful in imparting texture on the BFPT matrix. In the case of SrTiO, a reduction in Curie temperature was observed (Tc = 350°C) due to the substitution of Sr+. Aurivillius templates resulted in high Curie temperatures (610 °C). However, the resulting ceramics show low remanent polarization, while SrTi03 and BaTi03 templated ceramics show higher remanent polarizations of36 and 30 llc/cm2 , respectively. There are many repolts in the literature describing the effect of texture on the magnetic and electric properties of materials. Texture is used to provide an enhancement in various properties, compared to random orientation, for example an increase in piezoelectric coefficien t, or remnant magnetization. In this work, molten salt and tape casting techniques were employed to synthesis textured bismuth ferrite based ceramics. The fabrication of highly-oriented polycrystalJine ceramics of Bi5Feo.SCOo.5 Ti JOl5 (BFCT), prepared via molten salt synthesis and uniax ial pressing of high aspect ratio pl atelets is reported. Electron backscatter images show a secondary phase within the ceramic which is rich in cobalt and iron. The concentration of the secondary phase obtained from scanning electron microscopy was estimated at < 2 % by volume, below the detection limit of X-ray diffraction. By fabricating textured BFCf, it can be shown that the observed ferromagnetic response is dominated by the secondary phase; although the material is textured, the magnetic response is anisotropic, proving that the BFCT matrix is not ferromagnetic. The templated grain growth techniq ue was used to synthesis textured 60BiFeOJ-40PbTiOJ or 60:40BFPT. Both Aurivillius templates (Bi4 Ti30 12 and PbBi4 Ti40 IS) and perovskite templates (BaTiO), SrTi03 and 0.4(NaII2BiIl2)Ti03-0.6PbTi03) were used to prepare 60:40BFPT. Only BaTiO) templates were successful in imparting texture on the BFPT matrix. In the case of SrTiOJ, a reduction in Curie temperature was observed (Tc = 350°C) due to the substitution of Sr+. Aurivillius templates resulted in high Curie temperatures (610 °C). However, the resulting ceramics show low remanent polarization, while SrTi03 and BaTi03 templated ceramics show higher remanent polarizations of36 and 30 llc/cm2 , respectively. Synchrorron measurements clearly show textured 6O:40BFPT using BaTi03 templates. Polari sation and strain field measurements were used to show that the resulting material wa<; ferroelectric, with a Ec of 6 kV/mm, a Pr of 30 llClcm2 and a total strain of 0.09%. Vibrating sample magnetometry was used, and showed magnetic anisotropy in the material fabricated using BaTiOJ templates. The coercive field of 177 Oe and maximum magnetization of 1.43 emu/g was obtained when magnetic field applied nonna] to the cast direction. By applying the magnetic field along (0 the cast direction, a far higher coercive field of 908 Oe, and lower maximum magnetization of 0.29 emu/g was reali zed. The reaction of Ba with the BFPT matrix leads to the generation of ferromagnetic ordering, as opposed to the anti ferromagnetic ordering observed in BFPT prepared using conventional processing. In summary, the template grain growth technique has been used to generate textured Ba-doped BFPT. The resulting materia] is both ferrom agnetic and ferroelectric at room temperature.
6

Turner, Stuart Lee. "The structure of bismuth ferrite - lead titanate (BiFeO3 - PbTiO3)." Thesis, University of Leeds, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.507885.

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7

Burnett, Timothy Laurence. "Growth and charaterisation of bismuth ferrite lead titanate single crystals." Thesis, University of Leeds, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.487709.

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Bismuth ferrite lead titanate (BFPT) shows potential in high temperature piezoelectric and ferroelectric applications as well in the emerging field of multiferroic research. Single crystals of (BFPT) have been grown for the first time using the flux growth method.
8

Shenton, John Kane. "First-principles investigations of structure-function relationships in bismuth ferrite." Thesis, University College London (University of London), 2018. http://discovery.ucl.ac.uk/10057684/.

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The simplicity of the basic perovskite structure belies a seemingly boundless potential for novel phenomena and technological applications. The ferroelectric perovskites, in particular, can have complex and subtle relationships between their crystal structures and functional properties. Understanding such structure-function relationships is a central theme of this work. In this work, advanced computational approaches are used to gain insight into key structure-function relationships in the multiferroic perovskite, bismuth ferrite (BFO). Density functional theory (DFT) has proven to be an immensely valuable tool in the study of condensed matter. However, techniques beyond standard DFT are often required to deal with the strongly localised electronic states in materials like BFO. In the first part of this thesis, we conduct a systematic study of a commonly used correction to DFT: DFT+U. We focus on the effect of the U parameter on the conduction band minimum (CBM) and valence band maximum (VBM). We find drastic changes to the location and curvature of the CBM in particular. Specifically, we find a surprising inversion in the ordering of the Fe t2g and eg manifolds at the CBM when U exceeds 4 eV. We therefore suggest caution when employing large values of U to calculate optoelectronic properties. In the second part of this work, motivated by the prospects of BFO-based photovoltaics, we investigate the influence of crystal structure on charge carrier effective masses. We begin by comparing the effective masses of several known phases of BFO, finding orders of magnitude differences between them. The strain-induced tetragonal phase emerged from this comparison as having the promising combination of a large spontaneous polarisation and relatively light charge carriers. Through a systematic decomposition of geometric relationships between different phases of BFO, we identify key physical influences on effective masses. We suggest that these insights could be exploited to improve photovoltaic efficiency. In the final part of this thesis, we enter the realm of designer materials. The creation and characterisation of atomically sharp interfaces between different complex oxides has proven to be an exciting and fruitful area of research in recent years. We investigate superlattices made up of repeating lanthanum aluminate (LAO) and BFO layers. By simply varying the thickness of the BFO layer, we found that one could tune the tetragonality, spontaneous polarisation and band gap of the superlattices. We also predict the formation of two-dimensional (2D) electron and hole gases at opposing interfaces above a critical thickness of BFO. The ferroelectric origin of the 2D gases, together with an emergent magnetism, suggests that this system may be a promising source of novel multiferroic functionality. In particular, we suggest the possibility of switching the 2D electron and hole gases via an external electric field.
9

Stevenson, Timothy James. "Magnetic and electric properties of bismuth ferrite lead titanate ceramics." Thesis, University of Leeds, 2010. http://etheses.whiterose.ac.uk/1371/.

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Solid solutions of multiferroic BiFeO3 doped with ferroelectric PbTiO3 (BFPT) can be prepared by conventional mixed oxide processing to produce a range of polycrystalline ceramics ranging throughout the xBiFeO3 - (1-x)PbTiO3 series. Sintered ceramics are shown to exhibit mixed tetragonal (P4mm) and rhombohedral (R3c) phase perovskite distortions from 0.4 ≤ x < 0.75, where at x ~ 0.75 a morphotropic phase boundary exists and compositions x > 0.75 are entirely rhombohedral. From extensive use of neutron diffraction experiments, the phase coexistence is attributed to compensation for the internal strain induced upon cooling through the ferroelectric Curie point from cubic, to the distorted tetragonal perovskite phase (ܿ/ܽ = 1.17). This drives a further partial transformation to the (~4 %) lower volume rhombohedral phase as a relief mechanism. Increasing the sinter temperature and fast cooling (> 900 °C/hr) sees the monolithic samples x ≤ 0.7 disintegrate to various levels of particulate size, when a critical grain size is exceeded (7 μm), which in turn is inversely proportional to the grain boundary fracture energy. The magnetic properties studied using high resolution powder diffractometry of these two states present G-type antiferromagnetism (AFM) in both the rhombohedral and tetragonal phases; but with Tn above ambient temperature for R3c, and below for P4mm for all compositions except x = 0.3. Compositions below this PbTiO3 rich solution are never observed to support antiferromagnetic order, as the dilution of magnetic iron ions exceeds the percolation threshold via substitution with titanium ions. The rhombohedral phase is shown to exhibit an incommensurate, modulated magnetic order, with a propagation vector perpendicular to the magnetization vector, which decreases in periodicity with increasing bismuth ferrite, from 840 Å for x = 0.75. At room temperature, transforming the paramagnetic tetragonally distorted powder to a G-type AFM rhombohedral phase, is observed with the application of hydrostatic pressure. Evident from neutron experiments, using the Pearl instrument at ISIS, full transformation can be achieved with moderate pressures of 0.77 GPa, effectively ‘switching’ on the magnetic order. The monolithic samples were used at 250 K to observe the changes in simultaneous structural and G-type antiferromagnetic properties as a function of applied electric field (0 to 10 MVm-1) for the most piezoelectrically active samples, around the MPB composition (x = 0.7), using neutron diffraction at the Berlin neutron scattering centre; instrument E2. An observed increase in rhombohedral phase occurs with the application of electric field from peak analysis, which relates to a proportional increase in observed antiferromagnetic intensity (5 %). These two behaviours are proposed to be linked by the internal strain developed within the system, from increased polarisation forcing a partial phase transformation from the tetragonal to the rhombohedral phase which can support the antiferromagnetic order at room temperature.
10

Wang, Naigang. "Multiferroic Bismuth Ferrite-Lead Titanate and Iron-Gallium Crystalline Solutions: Structure-Property Investigations." Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/33854.

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Recently, multiferroics-defined as materials with coexistence of at least two of the ferroelectric, ferroelastic and ferromagnetic effects-have attracted enormous research activities. In this thesis, the structure and properties of multiferrioic BiFeO3-x%PbTiO3 and Fe-x%Ga crystalline solutions were investigated. First, the results show that modified BiFeO3-PbTiO3 based ceramics have significantly enhanced multiferroic properties, relative to BiFeO3 single crystals. The data reveal: (i) a dramatic increase in the induced polarization; and (ii) the establishment of a remnant magnetization by a breaking of the translational invariance of a long-period cycloidal spin structure, via substituent effects. In addition, temperature dependent magnetic permeability investigations of BiFeO3-xPbTiO3 crystalline solutions have shown that aliovalent La substitution results in a significant increase in the permeability. Second, room temperature high-resolution neutron and x-ray diffraction studies have been performed on Fe-x%Ga crystals for 12Master of Science
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Книги з теми "Ferrite de Bismuth":

1

Jadhav, Vijaykumar V., Rajaram S. Mane, and Pritamkumar V. Shinde. Bismuth-Ferrite-Based Electrochemical Supercapacitors. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-16718-9.

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2

Mane, Rajaram S., Vijaykumar V. Jadhav, and Pritamkumar V. Shinde. Bismuth-Ferrite-Based Electrochemical Supercapacitors. Springer, 2020.

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Частини книг з теми "Ferrite de Bismuth":

1

Wu, Jiagang. "Bismuth Ferrite-Based Piezoelectric Materials." In Advances in Lead-Free Piezoelectric Materials, 301–78. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-8998-5_6.

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2

Jadhav, Vijaykumar V., Rajaram S. Mane, and Pritamkumar V. Shinde. "Electrochemical Supercapacitors of Bismuth Ferrites." In Bismuth-Ferrite-Based Electrochemical Supercapacitors, 69–84. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-16718-9_5.

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3

Jadhav, Vijaykumar V., Rajaram S. Mane, and Pritamkumar V. Shinde. "Introduction." In Bismuth-Ferrite-Based Electrochemical Supercapacitors, 1–10. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-16718-9_1.

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4

Jadhav, Vijaykumar V., Rajaram S. Mane, and Pritamkumar V. Shinde. "Electrochemical Supercapacitors: History, Types, Designing Processes, Operation Mechanisms, and Advantages and Disadvantages." In Bismuth-Ferrite-Based Electrochemical Supercapacitors, 11–36. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-16718-9_2.

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5

Jadhav, Vijaykumar V., Rajaram S. Mane, and Pritamkumar V. Shinde. "Basics of Ferrites: Structures and Properties." In Bismuth-Ferrite-Based Electrochemical Supercapacitors, 37–45. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-16718-9_3.

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6

Jadhav, Vijaykumar V., Rajaram S. Mane, and Pritamkumar V. Shinde. "Bismuth Ferrites: Synthesis Methods and Experimental Techniques." In Bismuth-Ferrite-Based Electrochemical Supercapacitors, 47–67. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-16718-9_4.

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7

Jadhav, Vijaykumar V., Rajaram S. Mane, and Pritamkumar V. Shinde. "Limitations and Perspectives." In Bismuth-Ferrite-Based Electrochemical Supercapacitors, 85–90. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-16718-9_6.

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8

Seidel, Jan. "Electronic and Optical Properties of Domain Walls and Phase Boundaries in Bismuth Ferrite." In Bismuth-Containing Compounds, 305–20. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-8121-8_13.

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9

You, Lu, and Junling Wang. "Multiferroism and Magnetoelectric Applications in Bismuth Ferrite." In Functional Materials and Electronics, 97–162. Oakville, ON ; Waretown, NJ : Apple Academic Press, [2017]: Apple Academic Press, 2018. http://dx.doi.org/10.1201/9781315167367-3.

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10

Verma, Ritesh, Ankush Chauhan, Neha, and Rajesh Kumar. "Multiferroic Material Bismuth Ferrite (BFO): Effect of Synthesis." In Engineering Materials, 143–65. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-7454-9_9.

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Тези доповідей конференцій з теми "Ferrite de Bismuth":

1

Kumar, Pawan, and Manoranjan Kar. "Effect of excess bismuth on synthesis of bismuth ferrite." In PROCEEDING OF INTERNATIONAL CONFERENCE ON RECENT TRENDS IN APPLIED PHYSICS AND MATERIAL SCIENCE: RAM 2013. AIP, 2013. http://dx.doi.org/10.1063/1.4810590.

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2

Yesner, G., and A. Safari. "Multiferroic bismuth ferrite based thin films." In 2013 Joint IEEE Int'l Symp on Applications of Ferroelectrics & Workshop on Piezoresponse Force Microscopy (ISAF/PFM). IEEE, 2013. http://dx.doi.org/10.1109/isaf.2013.6748731.

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3

Rivera, Rut, and A. Safari. "Fabrication of bismuth ferrite nanofibers via electrospinning." In 2013 Joint IEEE Int'l Symp on Applications of Ferroelectrics & Workshop on Piezoresponse Force Microscopy (ISAF/PFM). IEEE, 2013. http://dx.doi.org/10.1109/isaf.2013.6748682.

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4

Kaswan, Kavita, Ashish Agarwal, Sujata Sanghi, and Jogender Singh. "Improved multiferroic properties of bismuth ferrite and sodium bismuth titanate based multiferroic composites." In DAE SOLID STATE PHYSICS SYMPOSIUM 2018. AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5113332.

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5

Chakrabarty, N., and A. K. Chakraborty. "Hydrothermal synthesis of bismuth ferrite nanostructures for supercapacitor." In Proceedings of the International Conference on Nanotechnology for Better Living. Singapore: Research Publishing Services, 2016. http://dx.doi.org/10.3850/978-981-09-7519-7nbl16-rps-152.

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6

Dhir, Gitanjali, and N. K. Verma. "Enhanced magnetization in Dy-doped Bismuth ferrite nanoparticles." In 3RD INTERNATIONAL CONFERENCE ON CONDENSED MATTER AND APPLIED PHYSICS (ICC-2019). AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0001426.

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7

Singh, S. K., and H. Ishiwara. "Bismuth ferrite Thin Films for Advanced FeRAM Devices." In 2005 International Conference on Solid State Devices and Materials. The Japan Society of Applied Physics, 2005. http://dx.doi.org/10.7567/ssdm.2005.h-8-3.

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8

Chen, L., Z. Mao, J. Zhang, and X. Chen. "The magnetic augment in the nitrogen substituted bismuth ferrite." In 2015 IEEE International Magnetics Conference (INTERMAG). IEEE, 2015. http://dx.doi.org/10.1109/intmag.2015.7157357.

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9

Saw, C. K., and I. L. Kalnin. "Diffraction Studies of Ferroelectric Lead Titanate Bismuth Ferrite Ceramic." In Sixth IEEE International Symposium on Applications of Ferroelectrics. IEEE, 1986. http://dx.doi.org/10.1109/isaf.1986.201175.

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10

Bell, Andrew J., Timothy P. Comyn, Mikael A. Khan, Timothy Stevenson, and Timothy Burnett. "Structure-property relations in multifunctional bismuth ferrite - lead titanate." In 2008 17th IEEE International Symposium on the Applications of Ferroelectrics (ISAF). IEEE, 2008. http://dx.doi.org/10.1109/isaf.2008.4693781.

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Звіти організацій з теми "Ferrite de Bismuth":

1

Ahmed, M. A., M. S. Ayoub, M. M. Mostafa, and M. M. El-Desoky. Structural and multiferroic properties of nanostructured barium doped Bismuth Ferrite. Edited by Lotfia Elnai and Ramy Mawad. Journal of Modern trends in physics research, December 2014. http://dx.doi.org/10.19138/mtpr/(14)81-89.

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