Magnetic Properties of Barium Ferrite Prepared by Hydrothermal Synthesis

Chen, Min; Fan, Run Hua; Liu, Gui Fang; Wang, Xu Ai

doi:10.4028/www.scientific.net/kem.655.178

Cited by 5 publications

(3 citation statements)

References 10 publications

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“…Во-вторых, высокие температуры синтеза исключают получение гексаферритов, легированными также легколетучими элементами. В качестве альтернатив твердофазному синтезу оксидных материалов предложены методы: гидротермальный, микроволновый, соосаждения и контролируемого горения [32][33][34][35][36][37][38][39][40][41]. Преимущества последнего перед керамическим: более высокая степень однородности образцов в силу распределения компонентов на ионном уровне, большая удельная поверхность, а также значительное снижение температуры синтеза [39][40]42].…”

Section: Introductionunclassified

Application of Self-Combustion Method for Synthesis of Aluminum-Substituted Barium Hexaferrite

Chernukha,

Zvereva,

Zirnik

et al. 2021

Chem

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Oxide materials have traditionally attracted the attention of researchers around the world. This is due to their wide range of applications: electrical engineering, electronics, special coatings, chemical technologies, etc. Doping of oxide materials with various elements such as Al, Bi, Zn, Co, Sn, Ti, B, Sb and others is widespread in order to fine-tune their physicochemical properties. In particular, doping of barium hexaferrite with aluminum is of particular interest, since this allows one to change such important parameters as saturation magnetization (σS), coercive force (HC), squareness coefficient of the hysteresis loop (K), as well as to influence the anisotropy field and microwave properties of the material. Since the preparation of BaAlxFe12-xO19 by the classical ceramic method requires thorough grinding of the starting materials, preliminary sintering, high temperature (above 1300 °C) and duration of the synthesis, it was decided to test an alternative method for obtaining aluminum-substituted barium hexaferrite. As such, we have chosen the self-combustion method. During the synthesis a solution of nitrates of the corresponding metals with citric acid was prepared. After neutralization and evaporation of the solution, the resulting mass was heated in a muffle furnace to carry out the spontaneous combustion process and remove residual carbon. The final sintering of samples with the composition BaAlxFe12-xO19 (for x = 0, 1, 2, and 3) was carried out in a muffle furnace with a precision temperature controller at 1100 °C for 4 hours. The obtained samples were studied by the powder diffractometry method, scanning electron microscopy, and X-ray spectral microanalysis. It has been established that the self-ignition method makes it possible to obtain homogeneous samples of barium hexaferrite substituted with aluminum at a lower temperature compared to the classical ceramic method. The parameters of the structure of the obtained samples were also determined. The tested method not only makes it possible to obtain aluminum-substituted barium hexaferrite at lower temperatures, but also makes it possible to dope ferrites with highly volatile elements.

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Section: Introductionunclassified

Application of Self-Combustion Method for Synthesis of Aluminum-Substituted Barium Hexaferrite

Chernukha,

Zvereva,

Zirnik

et al. 2021

Chem

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“…There are several methods that have been developed for the synthesis of barium ferrite, such as chemical co-precipitation, [12][13][14][15] glass-crystallization, [16,17] micro-emulsion, [18] sol-gel [19,20] and hydrothermal methods. [21,22] Considering the stability of the reaction, we focused on the chemical co-precipitation method and used the hexadecyltrimethyl ammonium bromide (CTAB) as surfactant. [23] After low temperature calcination, the precursor transformed into the uniform hexagonal barium ferrite.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Uniform Barium Ferrite Powders by Co-Precipitation Method

Chen

Fan

Zhang

et al. 2017

MSF

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The uniform hexagonal barium ferrite powders were synthesized by co-precipitation method using metal chloride. The effects of the amount of hexadecyltrimethyl ammonium bromide (CTAB), the water bath and calcination temperature on the phase formation, microstructure and density of barium ferrites were systematically investigated. The results showed that the formation of uniform hexagonal barium ferrite powders was significantly influenced by the amount of CTAB and the water bath could lead to the larger grain size and density. The SEM demonstrated that the BaFe12O19 powders had plate-like shape with crystallite sizes varing from 150 to 200 nm. When the amount of CTAB was 0.2g/100ml and the calcination temperature was 850 °C, the barium ferrite powders were uniform which indicated that the amount of surfactant and calcination temperature were very optimum.

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“…Исходя из вышесказанного, был предложен ряд альтернативных методов получения оксидных материалов: гидротермальный [42,49,50], соосаждения [42,47,51], микроволновый [52][53][54][55], а также золь-гель метод или метод контролируемого горения [40,42,45,56]. Данный способ основан на реакции взаимодействия окислителей (нитратов металлов) с органическими восстановителями (например, лимонной кислотой), в результате чего образуется объѐмный ксерогель, который при дальнейшем прокаливании и спекании даѐт требуемый оксид.…”

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Synthesis of Barium Hexaferrite by the Self-combustion Method

Chernukha,

Zvereva,

Zirnik

et al. 2021

Chem

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Until now, the ceramic method remains the most common for synthesis of complex oxides. In this case powders of oxides, carbonates or hydroxides of the required metals are sintered in air or in a controlled atmosphere after thorough mixing. However, it has several disadvantages. The most significant of them is the need to achieve high synthesis temperatures, which leads to an in-crease in the particle size. In addition, due to the latter circumstance, the resulting materials have a low specific surface area, which makes it impossible to use them as catalytic materials. The main advantages of this method are: low cost and availability of initial reagents, no need to use solvents, simplicity of the procedure, and a wide range of materials obtained. The results of ob-taining barium hexaferrite BaFe12O19 by the self-combustion method are presented. During the synthesis, a solution of nitrate salts of the corresponding metals with citric acid was prepared. Af-ter neutralization and evaporation of the solution, the resulting sample was heated in a furnace to carry out the spontaneous combustion process and remove residual carbon. The final sintering was carried out in a tube furnace with a precise temperature controller. The samples obtained were investigated by the powder diffractometry, scanning electron microscopy, X-ray spectral microanalysis, and thermal analysis. It was found that the spontaneous combustion method made it possible to obtain homogeneous barium hexaferrite at a lower temperature (by 200 °C) in comparison with the classical ceramic method. For the synthesized BaFe12O19, the structural parameters are a = 5.891 Å, c = 23.215 Å, V = 697.6 Å3. The used method makes it possible to synthesize promising oxide materials with developed surface under milder conditions, as well as to alloy oxides with highly volatile elements.

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Magnetic Properties of Barium Ferrite Prepared by Hydrothermal Synthesis

Cited by 5 publications

References 10 publications

Application of Self-Combustion Method for Synthesis of Aluminum-Substituted Barium Hexaferrite

Application of Self-Combustion Method for Synthesis of Aluminum-Substituted Barium Hexaferrite

Synthesis of Uniform Barium Ferrite Powders by Co-Precipitation Method

Synthesis of Barium Hexaferrite by the Self-combustion Method

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