Al-doped yttrium iron garnets Y3AlFe4O12: Synthesis and properties

Белоус, А. Г.; Tovstolytkin, A. I.; Fedorchuk, Oleksandr; Shlapa, Yuliia; Solopan, Sergii; Khomenko, B. S.

doi:10.1016/j.jallcom.2020.158140

Cited by 9 publications

(4 citation statements)

References 45 publications

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“…It is well known that the coprecipitation method is an effective route to synthesize powders possessing proper characteristics toward transparent ceramics. The characteristics of the coprecipitated powders are sensitive to the nature of the mixed salts solution and precipitant as well as synthesis conditions [29][30][31]. According to Hu [32] et al, calcination temperature has a significant influence on the dispersity, grain growth, and sinterability of nanopowders.…”

Section: Introductionmentioning

confidence: 99%

Pressureless Sintering of YIG Ceramics from Coprecipitated Nanopowders

Yang

Liu

et al. 2021

Magnetochemistry

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Nanoparticles prepared by the coprecipitation method were used as raw materials to fabricate Y3Fe5O12 (YIG) ceramics by air pressureless sintering. The synthesized YIG precursor was calcinated at 900–1100 °C for 4 h in air. The influences of the calcination temperature on the phase and morphology of the nanopowders were investigated in detail. The powders calcined at 1000–1100 °C retained the pure YIG phase. YIG ceramics were fabricated by sintering at 1200–1400 °C for 10 h, and its densification behavior was studied. YIG ceramics prepared by air sintering at 1250 °C from powders calcinated at 1000 °C have the highest in-line transmittance in the range of 1000-3000 nm. When the sintering temperature exceeds 1300 °C, the secondary phase appears in the YIG ceramics, which may be due to the loss of oxygen during the high-temperature sintering process, resulting in the conversion of Fe3+ into Fe2+.

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Section: Introductionmentioning

confidence: 99%

Pressureless Sintering of YIG Ceramics from Coprecipitated Nanopowders

Yang

Liu

et al. 2021

Magnetochemistry

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“…For comparison, Zn x Ni 1-x Fe 2 O 4 materials were synthesized by co-precipitation from aqueous solutions. A route similar to that described in [25] was used. The solutions of Ni(NO 3 ) 2 , Zn(NO 3 ) 2 , and Fe(NO 3 ) 3 were used as initial reagents.…”

Section: Introductionmentioning

confidence: 99%

Microemulsion-Based Method of Synthesis of Zinc-Nickel Ferrite and Their Magnetic Properties

et al. 2022

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Solid solutions of nickel-zinc ferrites ZnxNi1-xFe2O4 were synthesized by two different methods: synthesis in microemulsions and by stepwise precipitation. The properties of the resulted nano-sized particles synthesized by two different methods were compared. It was found that the increase in zinc content leads to an increase in the lattice parameters. During the synthesis by the method of microemulsions, the temperature of a single-phase product formation is 400 °C, while by the method of precipitation, a single-phase product formation begins at 600 °C. It was shown that the materials synthesized by both methods have similar unit cell parameters. The average size of ferrite nanoparticles synthesized in microemulsions is smaller, lattice strain is higher compared to ferrites synthesized by stepwise precipitation. Also, lower treatment temperatures provide higher stoichiometry, and homogeneity of materials while magnetization difference is negligible. The particles of the obtained powders have high saturation magnetization Ms = 45.6 Am2/kg for synthesis from microemulsions and Ms = 44.8 Am2/kg for co-precipitated samples, the low coercive force Hc = 1.3 kA/m and Hc = 3 kA/m, respectively. Changes made make synthesized particles more applicable in film deposition, and manufacturing of high-quality magnetic coatings.

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“…достаточно большого размера частиц порошков) [40,42,46,47], высокая температура синтеза и продолжительная выдержка при спекании [47][48]. Кроме того, в силу последнего обстоятельства, получаемые материалы обладают низким значением удельной поверхности, что делает невозможным их применения в качестве каталитических материалов.…”

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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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Al-doped yttrium iron garnets Y3AlFe4O12: Synthesis and properties

Cited by 9 publications

References 45 publications

Pressureless Sintering of YIG Ceramics from Coprecipitated Nanopowders

Pressureless Sintering of YIG Ceramics from Coprecipitated Nanopowders

Microemulsion-Based Method of Synthesis of Zinc-Nickel Ferrite and Their Magnetic Properties

Synthesis of Barium Hexaferrite by the Self-combustion Method

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