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Zeitschriftenartikel zum Thema „Ferrites de cobalt“

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Veröffentlicht am 25. Mai 2024

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1

de la Torre, Ernesto, Ana Lozada, Maricarmen Adatty, and Sebastián Gámez. "Activated Carbon-Spinels Composites for Waste Water Treatment." Metals 8, no. 12 (2018): 1070. http://dx.doi.org/10.3390/met8121070.

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Nowadays, mining effluents have several contaminants that produce great damage to the environment, cyanide chief among them. Ferrites synthesized from transition metals have oxidative properties that can be used for cyanide oxidation due to their low solubility. In this study, cobalt and copper ferrites were synthesized via the precipitation method, using cobalt nitrate, copper nitrate, and iron nitrate as precursors in a molar ratio of Co or Cu:Fe = 1:2 and NaOH as the precipitating agent. The synthesized ferrites were impregnated in specific areas on active carbon. These composites were char
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Boss, Alan F. N., Antonio C. C. Migliano, and Ingrid Wilke. "The Influence of Stoichiometry on the Index of Refraction of Cobalt Ferrite Samples at Terahertz Frequencies." MRS Advances 2, no. 58-59 (2017): 3663–66. http://dx.doi.org/10.1557/adv.2017.355.

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ABSTRACT We report an experimental study on the terahertz frequency dielectric properties of manganese cobalt ferrites (MnxCo1−xFe2O4) and nickel cobalt ferrites (NixCo1-xFe2O4) with three different stoichiometry each, x=0.3, x=0.5 and 0.7. Particularly, we present a comparison and discussion of the terahertz frequency indices of refraction of these two ferrites compositions. MnxCo1−xFe2O4 and NixCo1-xFe2O4 pellets with different Mn/Co and Ni/Co ratios (x=0.3, x=0.5 and x=0.7) were prepared by state-of-the-art ceramic processing. The morphology and chemical homogeneity of these ferrites were c
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Al-Kadhi, Nada S., Ghadah M. Al-Senani, Rasmiah S. Almufarij, Omar H. Abd-Elkader, and Nasrallah M. Deraz. "Green Synthesis of Nanomagnetic Copper and Cobalt Ferrites Using Corchorus Olitorius." Crystals 13, no. 5 (2023): 758. http://dx.doi.org/10.3390/cryst13050758.

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This study aims to develop a self-combustion method for use in the preparation of copper and cobalt ferrites. This development was based on the full use of dry leaves of Corchorus olitorius plant in order to stimulate the preparation of the studied ferrites by making full use of the small amount of carbon produced from the combustion process. The fabrication of CuFe2O4 and CoFe2O4 with spinel-type structures and the Fd3m space group is confirmed by XRD and FTIR investigations. Two major vibration bands occur laterally at 400 cm−1 and 600 cm−1. We were able to understand the existence of two st
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Pussi, Katariina, Keying Ding, Bernardo Barbiellini, et al. "Atomic Structure of Mn-Doped CoFe2O4 Nanoparticles for Metal–Air Battery Applications." Condensed Matter 8, no. 2 (2023): 49. http://dx.doi.org/10.3390/condmat8020049.

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We discuss the atomic structure of cobalt ferrite nanoparticles doped with Mn via an analysis based on combining atomic pair distribution functions with high energy X-ray diffraction and high-resolution transmission electron microscopy measurements. Cobalt ferrite nanoparticles are promising materials for metal–air battery applications. Cobalt ferrites, however, generally show poor electronic conductivity at ambient temperatures, which limits their bifunctional catalytic performance in oxygen electrocatalysis. Our study reveals how the introduction of Mn ions promotes the conductivity of the c
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Frolova, Liliya A. "Investigation of Magnetic and Photocatalytic Properties of CoFe2O4 Doped La3+, Nd3+, I3+." ECS Meeting Abstracts MA2022-01, no. 30 (2022): 2496. http://dx.doi.org/10.1149/ma2022-01302496mtgabs.

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Cobalt ferrites are widely used for permanent magnets, magnetic fluids, microwave devices, high density information storage and environmental technologies. The properties of nanosized magnetic materials strongly depend on the shape, size, and phase composition of the particles. The great interest of researchers in nanosized materials in recent years is associated with the possibility of changing the properties of magnetic materials by controlling the particle size and distribution of cations over sublattices in ferrite [1]. Nanoparticles of doped cobalt ferrite showed improved physicochemical
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Majid, Farzana, Amarah Nazir, Sadia Ata, et al. "Effect of Hydrothermal Reaction Time on Electrical, Structural and Magnetic Properties of Cobalt Ferrite." Zeitschrift für Physikalische Chemie 234, no. 2 (2020): 323–53. http://dx.doi.org/10.1515/zpch-2019-1423.

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AbstractCobalt ferrite was synthesized by hydrothermal route in order to investigate the effect of hydrothermal reaction time on structural, magnetic and dielectric properties. The synthesized cobalt ferrite was characterized by X-ray diffraction, Fourier transform infrared and Vibrating-Sample Magnetometer (VMS). XRD data analysis confirmed the formation of cubic inverse spinel ferrite for complete time series as the high intensity peak corresponds to cubic normal spinel structure. The ionic radii, cation distribution among tetrahedral and octahedral sites, lattice parameters, X-ray density,
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Hochu, F., and M. Lenglet. "Co(II) Optical Absorption in Spinels: Infrared and Ligand-Field Spectroscopic Study of the Ionicity of the bond. Magnetic Structure and Co2+→Fe3+MMCT in Ferrites. Correlation with the Magneto-Optical Properties." Active and Passive Electronic Components 20, no. 3 (1998): 169–87. http://dx.doi.org/10.1155/1998/16871.

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The analysis of the infrared and ligand field spectra of COM2O4spinels reveals that the ionicity of these compounds varies in the following order aluminate > gallate > ferrite and chromite > rhodite and cobaltite. A linear relation has been established between the Δ(LO-TO)1splitting, Racah parameter and the ionic-covalent parameterSSp=ΣICP+tetra∑ICPocta. The influence of strong superexchange interactions on the optical spectrum of cobalt ferrites has been studied. The cation distribution has been established by EXAFS and XANES measurements. The cluster (CoFeO10)15–is characterized by
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Gupta, Priyanka, Dr Ravi Kumar Vijai, and Subhash Chander. "Synthesis, Characterization and Magnetic properties of Nanoparticles of Cobalt Doped Ferrite." International Journal of Chemistry, Mathematics and Physics 6, no. 5 (2022): 06–11. http://dx.doi.org/10.22161/ijcmp.6.5.2.

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Ferrites are ceramic like material having magnetic properties which are being utilized for several applications. Cobalt ferrites are hard magnetic material with high coercivity. In our study Crystalline, Magnetic nanoparticles of Cobalt ferrite Co0.8Fe2.2O4 were synthesized by Sol Gel Method using ferric chloride and cobalt nitrate with NaOH as a reactant. Structural characteristics of samples were determined by X-Ray diffraction, FESEM and TEM. Particle size found 14.26nm by using Debye Scherrer method. Scanning electron microscopic (SEM) studies revealed nano-crystalline nature of the sample
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Kikuchi, Takeyuki, Tatsuya Nakamura, Masamichi Miki, et al. "Synthesis of Hexagonal Ferrites by Citric Complex Method." Advances in Science and Technology 45 (October 2006): 697–700. http://dx.doi.org/10.4028/www.scientific.net/ast.45.697.

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Various hexagonal ferrites, which include hard and soft ferrites, were prepared by citric complex method. High purity reagent of strontium carbonate, iron (III) nitrate ennnahydrate, cobalt (II) nitrate hexahydrate and lanthanum oxide were used as starting materials. Prepared aqueous solution was heated for dehydration and gelling. Thermal pyrolysis was carried out by heating the gel. The obtained precursor powders were ground with an alumina mortar and compacted by uniaxial pressing into disk specimens and then heated at temperature range between 1023K and 1523K in air. Phase identification a
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Zhang, Chang Sen, Lei Yang, and Feng Zhou. "Preparation and Microstructure of Co-Ferrite Fine Powder." Advanced Materials Research 328-330 (September 2011): 1365–68. http://dx.doi.org/10.4028/www.scientific.net/amr.328-330.1365.

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Cobalt ferrites were prepared by citrate sol-gel method, chemical co-precipitation, mechanical grinding, respectively. The grain size, morphology, and the size of crystal particles were studied by x-ray diffraction (XRD) and scanning electron microscope (SEM). Cobalt ferrite showed different morphologys when prepared by different methods, It was tapered corners which prepared by sol-gel method; It was tetrahedral which prepared by mechanical grinding method; It was sphere which prepared by chemical co-precipitation method. The average grain size of cobalt ferrite was less than 100nm, while par
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Tomiczek, A. E. "Effect of milling time on microstructure of cobalt ferrites synthesized by mechanical alloying." Archives of Materials Science and Engineering 111, no. 1 (2021): 5–13. http://dx.doi.org/10.5604/01.3001.0015.5561.

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Purpose: of this paper is to determine the effect of manufacturing conditions, especially milling time, on the microstructure and phase composition of CoFe2O4 cobalt ferrite. Design/methodology/approach: Cobalt ferrite (CoFe2O4) has been synthesised from a stoichiometric mixture of CoCo3 and α-Fe2O3 powders in a high energy planetary mill. Annealing at 1000°C for 6 hours after milling was used to improve the solid-state reaction. Calcinated samples were analysed by X-ray diffraction (XRD), and transmission electron microscopy (TEM). The relationship between the milling time of powders, their m
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Gupta, Meenal, Anusree Das, Dipankar Das, Satyabrata Mohapatra, and Anindya Datta. "Chemical Synthesis of Rare Earth (La, Gd) Doped Cobalt Ferrite and a Comparative Analysis of Their Magnetic Properties." Journal of Nanoscience and Nanotechnology 20, no. 8 (2020): 5239–45. http://dx.doi.org/10.1166/jnn.2020.18528.

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Lanthanum (La) and gadolinium (Gd) doped cobalt ferrite nanoparticles are synthesized using a soft chemical approach. The analysis of these ferrites using X-ray diffraction (XRD) and transmission electron microscopy (TEM) shows that lattice spacing decreases in the doped ferrite samples. Magnetization data indicates towards the decrease of saturation magnetisation but increase in coercivity with doping. Mössbauer spectroscopy measurements at room temperature indicate increased occupancy of trivalent cations at tetrahedral site. The addition of rare earth dopants reduces the hard-magnetic chara
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Lazdovica, Kristīne, and Valdis Kampars. "Influence of Crystallite Size of Nickel and Cobalt Ferrites on the Catalytic Pyrolysis of Buckwheat Straw by Using TGA-FTIR Method." Key Engineering Materials 903 (November 10, 2021): 69–74. http://dx.doi.org/10.4028/www.scientific.net/kem.903.69.

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Pyrolysis of buckwheat straw with or without catalysts was investigated using the TGA-FTIR method to determine the influence of nickel and cobalt ferrites on the distribution of pyrolysis products. According to the obtained results, the overall shape of the thermogravimetric and derivative thermogravimetric curves is unchanged in the presence of nickel and cobalt ferrites but different weight losses were observed. All catalysts contribute to the formation of solid residue from BWS pyrolysis. The presence of cobalt ferrites exhibited the highest bio-oil yields, whereas the highest non-condensab
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Ortega López, Yudith, Hugo Medina Vázquez, Jesús Salinas Gutiérrez, Vanessa Guzmán Velderrain, Alejandro López Ortiz, and Virginia Collins Martínez. "Synthesis Method Effect of CoFe2O4on Its Photocatalytic Properties for H2Production from Water and Visible Light." Journal of Nanomaterials 2015 (2015): 1–9. http://dx.doi.org/10.1155/2015/985872.

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Currently, the need for more efficient materials that work in the visible light spectrum for hydrogen production has been increasing. Under this criterion, ferrites are ideal because their energetic properties are favorable to photocatalysis as they have a low band gap (1.5 to 3 ev). In this particular research, ferrite is presented as a hydrogen producer. Cobalt ferrites were synthesized by chemical coprecipitation (CP) and ball milling (BM) for comparison of their performance. The characterization of the materials was carried out with X-ray diffraction (XRD), scanning electron microscopy (SE
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15

Gupta, Priyanka, and Dr Ravi Kumar Vijai. "Synthesis, Characterization and Dielectric properties of Nanoparticles of Cobalt Doped Ferrite (Cox Fe1-x Fe2 O4)." International Journal of Chemistry, Mathematics and Physics 7, no. 4 (2023): 1–8. http://dx.doi.org/10.22161/ijcmp.7.4.1.

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Ferrites, a recently uncovered category of materials, have found extensive application in various critical domains. Among them, cobalt ferrites stand out as hard magnetic materials with exceptional coercivity.. We successfully prepared cobalt ferrites by using nanocrystalline powers by Sol gel method. In our study Crystalline, Magnetic nanoparticles of Cobalt ferrites (Cox Fe1-x Fe2 O4) (x = 0.4, 0.5, 0.6, 0.8) were synthesized by Sol Gel Method using ferric chloride and cobalt nitrate with NaOH as a reactant. Structural characteristics of samples were determined by X-Ray diffraction and TEM.
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Jameel, M. H., M. A. Agam, M. Q. Hamzah, M. S. Roslan, S. Z. H. Rizvi, and J. A. Yabagi. "Structural, optical and morphological properties of zinc -doped cobalt-ferrites CoFe2−xZnxO4 (x=0.1-0.5)." Digest Journal of Nanomaterials and Biostructures 16, no. 2 (2021): 399–408. http://dx.doi.org/10.15251/djnb.2021.162.399.

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Cobalt-ferrite (CoFe2O4) based nanoparticles are appropriate candidates for electrical, optical, and magnetic applications for electrical appliances. In the current study, a coprecipitation technique was used to prepare Zinc doped cobalt ferrites with compositions CoFe2−xZnxO4 (x=0.1-0.5) at various percentages using Zinc and Co-nitrate as precursors. The analysis of crystal phase structure, hkl planes, average crystalline size, volume, and lattice parameters of the unit cell of CoFe2-xZnxO4 doped (NPs) was carried under X-ray diffraction (XRD). X-ray spectra analysis, FT-IR Spectra, UV Visibl
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Amaro, Luís, Daniela Correia, Teresa Marques-Almeida, et al. "Tailored Biodegradable and Electroactive Poly(Hydroxybutyrate-Co-Hydroxyvalerate) Based Morphologies for Tissue Engineering Applications." International Journal of Molecular Sciences 19, no. 8 (2018): 2149. http://dx.doi.org/10.3390/ijms19082149.

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Polymer-based piezoelectric biomaterials have already proven their relevance for tissue engineering applications. Furthermore, the morphology of the scaffolds plays also an important role in cell proliferation and differentiation. The present work reports on poly(hydroxybutyrate-co-hydroxyvalerate) (PHBV), a biocompatible, biodegradable, and piezoelectric biopolymer that has been processed in different morphologies, including films, fibers, microspheres, and 3D scaffolds. The corresponding magnetically active PHBV-based composites were also produced. The effect of the morphology on physico-che
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Gatelyte, Aurelija, Darius Jasaitis, Aldona Beganskiene, and Aivaras Kareiva. "Sol-Gel Derived Ferrites: Synthesis and Characterization." Advanced Materials Research 222 (April 2011): 235–38. http://dx.doi.org/10.4028/www.scientific.net/amr.222.235.

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In the present work, the sinterability and formation of nanosized yttrium iron garnet (Y3Fe5O12), yttrium perovskite ferrite (YFeO3), cobalt, nickel and zinc iron spinel (CoFe2O4, NiFe2O4 and ZnFe2O4, respectively) powders by an aqueous sol-gel processes are investigated. The phase purity of synthesized nano-compounds was characterized by powder X-ray diffraction analysis (XRD). The microstructural evolution and morphological features of obtained transition metal ferrites were studied by scanning electron microscopy (SEM). The possible application of these nanosized transition metal ferrites a
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Walters, I., R. Shende, and J. A. Puszynski. "Hydrogen Production from Thermochemical Water-Splitting Using Ferrites Prepared by Solution Combustion Synthesis." Advances in Science and Technology 91 (October 2014): 32–38. http://dx.doi.org/10.4028/www.scientific.net/ast.91.32.

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Currently, there are several methods to produce spinel ferrite powder material such as sol-gel synthesis, self-propagating high-temperature synthesis (SHS), aerosol spray pyrolysis, and solution combustion synthesis (SCS). These methods have been shown to produce nominally phase pure ferrites for use in hydrogen generation by thermochemical water-splitting. Among these methods, the ferrites derived by SCS have not been fully investigated for hydrogen generation from thermochemical water-splitting. SCS, in general, has several advantages such as it being a simple synthesis that can be done rela
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Manimegalai, R., S. Sendhilnathan, and V. Chithambaram. "Experimental investigation on ferrofluid properties of Cd doped Co-Zn ferrites." Digest Journal of Nanomaterials and Biostructures 17, no. 2 (2022): 661–76. http://dx.doi.org/10.15251/djnb.2022.172.661.

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"Cadmium substituted Co-Zn ferrites 𝐶𝑜0.5𝑍𝑛0.5𝐶𝑑𝑥𝐹𝑒(2−𝑥)𝑂4 (𝑥=0.0, 0.1, 0.2, 0.4, and 0.5) were fabricated by using the Co-precipitation method. The molecular composition and prepared samples of cubic spinel structureswas characterized using X-ray diffraction peak (XRD). X-ray diffraction patterns obtained the most intensive peak at (311) crystallographic planes for x=0.5. Williamson-Hall (W-H) relation was associated with XRD data to determine the crystallite sizes range from 25.356 nm to 35.632 nm and strain value brought into being 0.0024 to 0.0021. Tetrahedral and octahedral sites of hopin
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Mullurkara, Suraj V., Ramon Egli, B. C. Dodrill, Susheng Tan, and P. R. Ohodnicki. "Understanding magnetic interactions and reversal mechanisms in a spinodally decomposed cobalt ferrite using first order reversal curves." AIP Advances 13, no. 2 (2023): 025328. http://dx.doi.org/10.1063/9.0000562.

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Cobalt ferrites exhibit widely varied magnetic behaviour due to the presence of a miscibility gap leading to the formation of periodic self-assembled nanostructures via spinodal decomposition. Periodicity and amplitude of the compositional fluctuations can be controlled by thermodynamic and kinetic processing parameters which allows for careful tuning of the magnetic properties. Although reports have shown evidence of spinodal decomposition, there is a lack of detailed characterization of the magnetic interactions and reversal mechanisms in these materials. In this work we use high-resolution
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El-Salam, Asmaa Reda Abd, K. E. Rady, Ezzat A. ELFadaly, and Mobarak Hassan Aly. "Enhanced Structural and Morphological Properties of Doped Cobalt Zinc Ferrite." Journal of Nanotechnology and Nanomaterials 4, no. 2 (2023): 89–93. http://dx.doi.org/10.33696/nanotechnol.4.046.

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In this study, Mn2+ substituted Co0.8−x Mnx Zn0.2 (where x = 0.0, 0.1, 0.2, and 0.3) ferrites are prepared by a coprecipitation method to study the effect of Mn2+ions on the structural and morphological properties. These ferrites are characterized by X-ray powder diffraction (XRD), and Fourier transform infrared. X-ray diffraction patterns of the prepared samples confirm partial substitution of Mn2+ ions that does not change the basic structure of Co0.8 Zn0.2 Fe2O4. It also provides information about the formation of a single-phase spinel structure without any secondary phase. It is concluded
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Shedam, Rakesh M., Priyanka P. Kashid, Shridhar N. Mathad, Rahul B. Deshmukh, Mahadev R. Shedam, and Ashok B. Gadkari. "Ferrites gas sensors: A Review." Physics and Chemistry of Solid State 23, no. 3 (2022): 626–40. http://dx.doi.org/10.15330/pcss.23.3.626-640.

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Gas sensors that are highly sensitive, stable, and selective are increasingly in demand to detect toxic gases. As a result of the need to monitor concentrations of these gases, humans, animals, and the environment are all protected. Metal ferrites (AFe2O3, where A is a metal) are a major factor in this field. The development of ferrite gas sensors has made remarkable advances in the detection of toxic gases from vehicle exhaust, biological hazards, environmental monitoring, and pollution monitoring over the last decade. It is important for ferrite gas sensors to consider parameters like phase
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Iacovita, Cristian, Gabriela Fabiola Stiufiuc, Roxana Dudric, et al. "Saturation of Specific Absorption Rate for Soft and Hard Spinel Ferrite Nanoparticles Synthesized by Polyol Process." Magnetochemistry 6, no. 2 (2020): 23. http://dx.doi.org/10.3390/magnetochemistry6020023.

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Spinel ferrite nanoparticles represent a class of magnetic nanoparticles (MNPs) with enormous potential in magnetic hyperthermia. In this study, we investigated the magnetic and heating properties of spinel soft NiFe2O4, MnFe2O4, and hard CoFe2O4 MNPs of comparable sizes (12–14 nm) synthesized by the polyol method. Similar to the hard ferrite, which predominantly is ferromagnetic at room temperature, the soft ferrite MNPs display a non-negligible coercivity (9–11 kA/m) arising from the strong interparticle interactions. The heating capabilities of ferrite MNPs were evaluated in aqueous media a
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Rasool, G., M. S. Shifa, H. M. N. H. K. Asghar, et al. "Characterization of Bi substitution of strontium cobalt zinc ferrites synthesized by micro-emulsion technique." Journal of Ovonic Research 19, no. 6 (2023): 695–704. http://dx.doi.org/10.15251/jor.2023.196.695.

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Strontium cobalt zinc bismuth ferrites with formula are provided in this study using formula Sr0.5Co0.4Zn0.4BixFe2-xO4 at different variation of x= 0.0, 0.05, 0.10, 0.15 synthesized by Micro-emulsion techniques. To check the physical characteristics of this series (Sr0.5Co0.4Zn0.4BixFe2-xO4) of nano-ferrites using FTIR (Fourier Transformation of infrared spectroscopy), UV-visible, X-ray diffraction and scanning electron microscope. SEM and XRD analysis were used to examine the structure and morphology of manufactured nano-ferrites. The spectra of XRD demonstrated the production of a single-pha
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Santosh, Dr Santosh Kumar, Avinash Chand Yadav, Prabhat Ranjan Tiwari, Gulab Singh, Parasmani Rajput, and Manvendra Kumar. "Synthesis and Characterization of Cobalt doped Zinc Ferrite for its Structural and Magnetic Properties." Asian Journal of Chemistry 35, no. 10 (2023): 2461–67. http://dx.doi.org/10.14233/ajchem.2023.28210.

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In this work, the synthesis of cobalt doped zinc ferrites CoxZn1-xFe2O4 for x = 0, 0.1, 0.2 and 0.3 by sol-gel method followed by selfignition root is reported. The prepared materials in powder form were characterized by HRXRD, FTIR, SEM and VSM analysis for its structural, vibrational and magnetic properties. Single phase cubic structure having fd3m space group of the zinc ferrites was revealed by HRXRD technique. The minimum crystallite size of Co doped ZnFe2O4 was found to be 26.11 nm for x = 0.1. The effect of cobalt in the prepared composites was studied using VESTA and Match3! Software f
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Bushkova, V. S. "Optical Properties of Ferrite Powders of NixCo1-xFe2O4 System." Фізика і хімія твердого тіла 16, no. 3 (2015): 506–10. http://dx.doi.org/10.15330/pcss.16.3.506-510.

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The aim of this work was to create and study of ferrite nickel-cobalt powders, using sol-gel technology with participation of auto-combustion. It is studied the optical properties of the powders depending on the degree of substitution of cobalt cations on nickel cations. As a result of analysis of the absorption spectra is revealed that for all investigated powders inherent allowed direct transition of electrons from the valence band to the conduction band. It was shown that the optical band gap increases with increasing concentration of nickel cations in the composition of ferrites.
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Amirov, Abdulkarim, Alexander Omelyanchik, Dmitry Murzin, et al. "3D Printing of PLA/Magnetic Ferrite Composites: Effect of Filler Particles on Magnetic Properties of Filament." Processes 10, no. 11 (2022): 2412. http://dx.doi.org/10.3390/pr10112412.

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Three-dimensional printing is one of the most promising areas of additive manufacturing with a constantly growing range of applications. One of the current tasks is the development of new functional materials that would allow the manufacture of objects with defined magnetic, electrical, and other properties. In this work, composite magnetic filaments for 3D printing with tunable magnetic properties were produced from polylactic acid thermoplastic polymer with the addition of magnetic ferrite particles of different size and chemical composition. The used magnetic particles were cobalt ferrite C
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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 bee
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Abdullah, Minhal, Syed Hasany, Muhammad Amir Qureshi, and Sajid Hussain. "Cost-Effective Synthesis of Cobalt Ferrite Nanoparticles by Sol-Gel Technique." Materials Science Forum 1067 (August 10, 2022): 213–19. http://dx.doi.org/10.4028/p-jdlq11.

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In material science, doping method is employed to produce nanoferrites with desired characteristics. Recently, cobalt doped iron oxide nanomaterials have gained importance in industry for multiple electronic/electrical applications. Large number of methods have been adopted for the synthesis of nanoparticles (NPs), but high manufacturing cost, uniform sized, and anisotropic behaviors limit the commercial applications. In the presented work, cobalt doped (Co-Fe nanomaterials) are developed by a cost-effective sol-gel approach. The doped cobalt ferrites NPs (1%, 2%, and 3% doping of cobalt) were
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Othéro de Brito, Vera Lúcia, Stéphanie Alá Cunha, Ana Paula Ribeiro Uchoas, Fabiana Faria de Araújo, Cristina Bormio Nunes, and Luis Antonio Genova. "Evaluation of the Sinterability of Copper-Substituted Ferrites by Means of Dilatometric Thermal Analysis." Materials Science Forum 805 (September 2014): 254–59. http://dx.doi.org/10.4028/www.scientific.net/msf.805.254.

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Cobalt and cobalt-manganese spinel ferrites have magnetostrictive properties suitable for application in magneto-electric and magneto-mechanical transducers. In this work, copper-substituted ferrites of these compositions were processed by means of the ceramic method and their sinterabilities were evaluated by dilatometric thermal analyses. The results obtained suggest that copper affects the solid-state reactions for the spinel formation and lowers the required sintering temperature for the ferrites. However, the densification obtained with sintering of the copper-substituted ferrites at 950o
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Jain, Prachi, S. Shankar, and O. P. Thakur. "Production of Green energy via Water Splitting mechanism by Mn- doped cobalt ferrites [Co1-xMnxFe2O4] based hydroelectric cells." Current Natural Sciences and Engineering 1, no. 2 (2024): 37–45. http://dx.doi.org/10.63015/2h-2419.1.2.

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In our current study, we have investigated the impact of manganese (Mn) doping on the structural, magnetic properties, and hydroelectric cell properties of cobalt ferrite with chemical formula [Co1-xMnxFe2O4, x=0.00, 0.125]. The solid-state approach has been utilized to synthesize the material. XRDmeasurements revealed the formation of an inverse spinel cubic structure with the space group Fd-3m. FTIR spectra hold a shift in the octahedral and tetrahedral bands with the increase in Mn content in cobalt ferrites. The subsequent rise in ferroelectric behavior has been observed with the net maxim
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Changwal, R., R. Ameta, and S. C. Ameta. "Oxidation of benzyl alcohols by molecular oxygen catalyzed by cobalt ferrite." Research Journal of Chemistry and Environment 28, no. 1 (2023): 91–97. http://dx.doi.org/10.25303/281rjce91097.

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Oxidation of alcohols to aldehydes/ketones/carboxylic acids is a crucial step in organic synthesis. Normally, strong oxidants oxidize alcohol to carboxylic acid and this reaction may or may not stop at the intermediate steps to form aldehyde and ketone. Some mild oxidants are required to stop it here at this stage. Here, molecular oxygen can help in achieving this objective, but there is a disadvantage to use molecular oxygen as an oxidant as it has a slow rate of oxidation. Hence, such a reaction may be catalyzed by metal ferrites. These metal ferrites are easy to separate by using an externa
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Beera, Chandra Sekhar, B. Dhanalakshmi, D. Nirmala Devi, et al. "Magnetic and Magnetostrictive Properties of Sol–Gel-Synthesized Chromium-Substituted Cobalt Ferrite." Gels 9, no. 11 (2023): 873. http://dx.doi.org/10.3390/gels9110873.

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Chromium (Cr)-doped cobalt ferrite nanoparticles were synthesized using a sol–gel autocombustion method, with the chemical formula CoCrxFe2xO4. The value of x ranged from 0.00 to 0.5 in 0.1 increments. X-ray diffraction analysis confirmed the development of highly crystalline cubic spinel structures for all samples, with an average crystallite size of approximately 40 to 45 nm determined using the Scherrer equation. Pellets were prepared using a traditional ceramic method. The magnetic and magnetostrictive properties of the samples were tested using strain gauge and VSM (vibrating sample magne
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Rostamzadehmansoor, S., Mirabdullah Seyed Sadjadi, K. Zare, and Nazanin Farhadyar. "Preparation of Ferromagnetic Manganese Doped Cobalt Ferrite-Silica Core Shell Nanoparticles for Possible Biological Application." Defect and Diffusion Forum 334-335 (February 2013): 19–25. http://dx.doi.org/10.4028/www.scientific.net/ddf.334-335.19.

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Magnetic oxide nanoparticles with proper surface coatings are increasingly being evaluated for clinical applications such as hyperthermia, drug delivery, magnetic resonance imaging, transfection and cell/protein separations. In this work, we investigated synthesis, magnetic properties of silica coated metal ferrite, (CoFe2O4)/SiO2 and manganese doped cobalt ferrite nanoparticles (Mnx-Co1-xFe2O4 with x = 0.02, 0.04 and 0.06)/SiO2 for possible biomedical application. All the ferrites nanoparticles were prepared by co-precipitation method using FeCl3.6H2O, CoCl2.6H2O and MnCl2.2H2O as precursors,
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Abdul Aziz, Siti Aishah, Saiful Amri Mazlan, U. Ubaidillah, et al. "Enhancement of Viscoelastic and Electrical Properties of Magnetorheological Elastomers with Nanosized Ni-Mg Cobalt-Ferrites as Fillers." Materials 12, no. 21 (2019): 3531. http://dx.doi.org/10.3390/ma12213531.

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Carbon-based particles, such as graphite and graphene, have been widely used as a filler in magnetorheological elastomer (MRE) fabrication in order to obtain electrical properties of the material. However, these kinds of fillers normally require a very high concentration of particles to enhance the conductivity property. Therefore, in this study, the nanosized Ni-Mg cobalt ferrite is introduced as a filler to soften MRE and, at the same time, improve magnetic, rheological, and conductivity properties. Three types of MRE samples without and with different compositions of Mg, namely Co0.5Ni0.2Mg
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Tsoncheva, Tanya, Radostina Ivanova, Nikolay Velinov, et al. "Design and Catalytic Behaviour of Hosted in Activated Carbon Foam CoxZn1−xFe2O4 Ferrites." Symmetry 13, no. 8 (2021): 1532. http://dx.doi.org/10.3390/sym13081532.

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Carbon foams with different surface functionality and tailored texture characteristics were prepared from mixtures containing coal tar pitch and furfural in different proportions. The obtained materials were used as a host matrix for the preparation of zinc- and cobalt-mixed ferrite nanoparticles. The texture, morphology, phase composition, and the related redox and catalytic properties of the obtained composites were characterized by low-temperature nitrogen physisorption, XRD, SEM, HRTEM, FTIR, Mössbauer spectroscopy, TPR and catalytic decomposition of methanol to syngas. The impact of the c
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Nandiyanto, Asep Bayu Dani, Yustika Desti Yolanda, Mia Widyaningsih, et al. "Techno-Economic Evaluation of the Production of Dysprosium-Doped Cobalt Ferrites Nanoparticles by Sol-Gel Auto-Combustion Method." Mathematical Modelling of Engineering Problems 9, no. 4 (2022): 1152–59. http://dx.doi.org/10.18280/mmep.090435.

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The purpose of this study was to examine two models of the economic feasibility of producing nanoparticle of dysprosium-doped cobalt ferrites by sol-gel auto-combustion method, from a laboratory scale to an industrial scale, including technical analysis and economic evaluation. Various economic evaluation parameters were analyzed to report the fabrication potential of dysprosium-doped cobalt ferrites nanoparticles in the case of the time required for a speculation to recover its total initial expenditure (PBP), the conditions of a generating project in the production function in years (CNPV),
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Choudary, G. S. V. R. K., P. Prameela, M. Chaitanya Varma, A. Mahesh Kumar, and K. H. Rao. "Contribution to Analysis of Co/Cu Substituted Ni-Zn Ferrites." Indian Journal of Materials Science 2013 (October 24, 2013): 1–7. http://dx.doi.org/10.1155/2013/350707.

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In this communication, Co/Cu substituted Ni-Zn ferrites processed through sol-gel synthesis using polyethylene glycol (PEG) as a chelating agent are studied, intending to aid in understanding and choosing the optimum ferrite material for high frequency applications. Lattice constant and average crystallite size have been estimated from FWHM of the X-ray diffraction peaks, and these parameters are understood by considering the ionic radii of the substituted as well as the replacing ions. Observed variations in saturation magnetization and initial permeability for these ferrites have been explai
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Rendale, Maruti K., S. N. Mathad, and Vijaya Puri. "Structural, mechanical and elastic properties of Ni0.7−xCoxZn0.3Fe2O4 nano-ferrite thick films." Microelectronics International 34, no. 2 (2017): 57–63. http://dx.doi.org/10.1108/mi-02-2016-0009.

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Purpose The present communication aims to investigate the influence of cobalt substitution on the structural, mechanical and elastic properties of nickel–zinc ferrite thick films. The changes observed in the crystallite size (D), lattice constant (a), texture coefficient [TC(hkl)] and mechanical and elastic properties of the thick films due to cobalt substitution have been reported systematically. Design/methodology/approach Ni–Zn ferrites with the stoichiometric formula Ni0.7−xCoxZn0.3Fe2O4 (where, x = 0, 0.04, 0.08, 0.12, 0.16 and 0.20) were synthesized via solution combustion technique usin
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Balatskiy, Denis, Yulia Budnikova, Svetlana Bratskaya, and Marina Vasilyeva. "TiO2-CoFe2O4 and TiO2-CuFe2O4 Composite Films: A New Approach to Synthesis, Characterization, and Optical and Photocatalytic Properties." Journal of Composites Science 7, no. 7 (2023): 295. http://dx.doi.org/10.3390/jcs7070295.

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Here, we report a new simple and fast method of cobalt and copper ferrites film fabrication on the Ti/TiO2 surface. The approach is based on the deposition of gelatin gel containing copper and cobalt nitrates on the surface of porous oxide-silicon coatings on titanium obtained by plasma electrolytic oxidation (PEO) followed by two-stage annealing at 300 °C and 800 °C to yield ferrite films with good adhesion to PEO layer. The presence of Co/Cu ferrite phases was confirmed by EDX analysis, XRD, and Mössbauer spectroscopy. TiO2-CoFe2O4 and TiO2-CuFe2O4 composite films have excellent performance
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Elsayed, Elsayed M., Hazem F. Khalil, Ibrahim A. Ibrahim, Mostafa R. Hussein, and Mohamed M. B. El-Sabbah. "The Significance of Buffer Solutions on Corrosion Processes of Cobalt Ferrite CoFe2O4 Thin Film on Different Substrates." Combinatorial Chemistry & High Throughput Screening 23, no. 7 (2020): 599–610. http://dx.doi.org/10.2174/1386207323666191217130209.

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Background: The spinel ferrite nanoparticles, such as zinc, nickel, and cobalt ferrites have exceptional electronic and magnetic properties. Cobalt ferrite nanomaterial (CoFe2O4) is a hard material that reveals high magnetic, mechanical, and chemical stability. Aim and Objective: The objective of this research is to predict the corrosion behavior of cobalt ferrite (CoFe2O4) thin films deposited on different substrates (platinum Pt, stainless steel S.S, and copper Cu) in acidic, neutral, and alkaline medium. Materials and Method: Cobalt ferrite thin films were deposited on platinum, stainless s
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Lin, Qing, Jinpei Lin, Yun He, Ruijun Wang, and Jianghui Dong. "The Structural and Magnetic Properties of Gadolinium Doped CoFe2O4Nanoferrites." Journal of Nanomaterials 2015 (2015): 1–6. http://dx.doi.org/10.1155/2015/294239.

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Gadolinium substituted cobalt ferrite CoGdxFe2−xO4(x= 0, 0.04, 0.08) powders have been prepared by a sol-gel autocombustion method. XRD results indicate the production of a single cubic phase of ferrites. The lattice parameter increases and the average crystallite size decreases with the substitution of Gd3+ions. SEM shows that the ferrite powers are nanoparticles. Room temperature Mössbauer spectra of CoGdxFe22−xO4are two normal Zeeman-split sextets, which display ferrimagnetic behavior. The saturation magnetization decreases and the coercivity increases by the Gd3+ions.
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Manimegalai, R., S. Sendhilnathan, V. Chithambaram, and M. Kumar. "Experimental investigation on ferrofluid properties of Cd doped Co-Zn ferrites." Digest Journal of Nanomaterials and Biostructures 18, no. 2 (2023): 547–55. http://dx.doi.org/10.15251/djnb.2023.182.547.

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The Co-Zn ferrites 𝐶𝐶𝐶𝐶0.5𝑍𝑍𝑍𝑍0.5𝐶𝐶𝐶𝐶𝑥𝑥𝐹𝐹𝐹𝐹(2−𝑥𝑥)𝑂𝑂4 (x-0.0, 0.1, 0.2, 0.3, 0.4, and 0.5) were synthesized by CO-precipitation method. The dielectric and structural properties has been investigated by effect of Cd doping in Co-Zn spinel ferrites. Dielectric constants were studied dependence of the frequency and temperature thus revealed that the dielectric dispersion based on the MaxwellWagner method polarizations are agreed with Koop’s conceptualization theory. Further, dielectric properties were studies over a frequency range from 10 kHZ to 30 MHZ. The dielectric constant is varied from 2.4
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Assem, E. E., A. M. Abden, and O. M. Hemada. "Thermal Properties of Cobalt Cadmium Ferrites." Key Engineering Materials 224-226 (June 2002): 831–34. http://dx.doi.org/10.4028/www.scientific.net/kem.224-226.831.

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Kale, G. M., and T. Asokan. "Electrical properties of cobalt‐zinc ferrites." Applied Physics Letters 62, no. 19 (1993): 2324–25. http://dx.doi.org/10.1063/1.109405.

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Lenglet, M., F. Hochu, and J. Dürr. "Optical Properties of Mixed Cobalt Ferrites." Le Journal de Physique IV 07, no. C1 (1997): C1–259—C1–260. http://dx.doi.org/10.1051/jp4:19971100.

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Caltun, Ovidiu, Ioan Dumitru, Marcel Feder, Nicoleta Lupu, and Horia Chiriac. "Substituted cobalt ferrites for sensors applications." Journal of Magnetism and Magnetic Materials 320, no. 20 (2008): e869-e873. http://dx.doi.org/10.1016/j.jmmm.2008.04.067.

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Velinov, Nikolay, Kremena Koleva, Tanya Tsoncheva, et al. "Copper-cobalt ferrites as catalysts for methanol decomposition." Open Chemistry 12, no. 2 (2014): 250–59. http://dx.doi.org/10.2478/s11532-013-0371-8.

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AbstractCopper-cobalt ferrites with composition Cu1−xCoxFe2O4, where x= 0.2 and 0.8 were prepared by thermal treatment of co-precipitated precursor. The obtained materials were characterized by TG-DSC, XRD, Transmission and Conversion Electron Mössbauer spectroscopy and temperature programmed reduction with hydrogen. The catalytic properties of ferrites were tested in methanol decomposition to CO and hydrogen.
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Andrade, Priscyla L., Valdeene A. J. Silva, Kathryn L. Krycka, et al. "The effect of organic coatings in the magnetization of CoFe2O4 nanoparticles." AIP Advances 12, no. 8 (2022): 085102. http://dx.doi.org/10.1063/5.0078167.

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Cobalt ferrite has attracted considerable attention in recent years due to its unique physical properties, such as high Curie temperature, large magnetocrystalline anisotropy, high coercivity, moderate saturation magnetization, large magnetostrictive coefficient, and excellent chemical stability and mechanical hardness. This work focuses on the neutron scattering results of the magnetic response characteristics of polysaccharide fucan coated cobalt ferrite nanoparticles for their application as a solid support for enzyme immobilization and other biotechnology applications. Here, we unambiguous
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