X-ray Diffraction and Magnetic Investigations of Lithium-Zinc Ferrites Synthesized by Electron Beam Heating

Суржиков, А. П.; Lysenko, Elena; Sheveleva, E. A.; Малышев, А. В.; Astafyev, A L; Vlasov, V. A.

doi:10.1007/s11664-017-5896-8

Cited by 4 publications

(2 citation statements)

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“…In this work, we studied the effect of mechanical activation of the initial mixture of NiO and Fe2O3 reagents on the preparation of nickel ferrite NiFe2O3. The obtained ferrite materials were investigated by thermal gravimetric and X-ray phase analyzes [9].…”

Section: Introductionmentioning

confidence: 99%

X-Ray and Thermogravimetric Analyzes of Mechanically Activated Nickel Ferrites

Astafyev

Nikolaev

Lysenko

et al. 2019

MSF

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This article shows a study of the effect of mechanical activation of the initial mixture of reagents NiO and Fe2O3 at different speeds of grinding bowl rotation on synthesis of nickel ferrite. Nickel ferrite was produced by the solid-phase synthesis at a temperature of 900 °C for 240 minutes. The obtained ferrite samples were investigated by thermal gravimetric and X-ray phase analysis. The Curie temperature values are obtained, as well as the magnitude of the change of detected instrument weight at the magnetic phase transition (ferromagnetic-paramagnetic) of nickel ferrite using thermal gravimetric curves (TG/DTG) with applied external magnetic field. Increasing of the homogeneity degree of ferrite materials with an increase in the mechanical activation rate is shown based on the data of X-ray phase analysis. The experimental results obtained from thermal, magnetic, and X-ray analyzes were compared.

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Section: Introductionmentioning

confidence: 99%

X-Ray and Thermogravimetric Analyzes of Mechanically Activated Nickel Ferrites

Astafyev

Nikolaev

Lysenko

et al. 2019

MSF

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“…Earlier, the results were shown a multiple increase in the rate of the reaction of solid-phase interaction. It was found that when materials are heated in an electron beam, the reactivity of the solid-phase system significantly increases, which makes it possible to significantly reduce the synthesis temperature and annealing time, as well as improve the homogeneity of the final product and improve the basic electromagnetic characteristics of ferrite [12][13][14]. Thus, in this paper we present results of synthesis of Li0.4Fe2.4Zn0.2O4 lithium-substituted ferrite under high-energy actions, including mechanical milling the initial mixture in a planetary mill and its heating under the high-energy electron beam.…”

Section: Introductionmentioning

confidence: 99%

Solid-Phase Formation of Li-Zn Ferrite under High-Energy Impact

Nikolaev

Lysenko

Суржиков

2019

MSF

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The effect of complex high-energy action, including mechanical milling of Li2CO3-Fe2O3-ZnO initial reagents mixture and its consistent heating by the pulsed electron beam on solid-phase synthesis was studied by X-ray powder diffraction and thermal analyses. The initial mixture Li2CO3-Fe2O3-ZnO corresponds to the ferrite with stoichiometric formula: Li0.5(1–x)ZnxFe2.5–0.5xО4, where х = 0.2. The same studies were carried out with thermal heating in a laboratory furnace for detection the effect of radiation on the formation of phase composition lithium-zinc ferrite. Initial mixture was milled in AGO-2S planetary ball mill with a milling speed of 2220 rpm for 60 min. Radiation-thermal synthesis of the milled mixture was carried out by the pulsed electron accelerator (ILU-6) at 600°C and 750°C. The maximum time of the isothermal stage was 60 minutes. According to the X-ray powder diffraction and thermogravimetric analysis, it was found that the complex high-energy action leads to decrease a temperature and time of obtaining lithium-zinc ferrite homogeneous in phase composition. The proposed high-energy regimes allow to synthesized lithium-zinc ferrites at 600 °C for 60 minutes, which is much lower compared to conventional ceramic technology.

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