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JOURNALS // Fizika Tverdogo Tela // Archive

Fizika Tverdogo Tela, 2020 Volume 62, Issue 7, Pages 1028–1035 (Mi ftt8369)

This article is cited in 6 papers

Magnetism

Features of the magnetic structure of Y$_{3}$Fe$_{5}$O$_{12}$ polycrystals synthesized by radiation thermal sintering

V. G. Kostishina, V. V. Korovushkina, A. G. Naloginb, S. V. Sherbakovb, I. M. Isaeva, A. A. Alekseevab, A. Yu. Mironovicha, D. V. Saloguba

a National University of Science and Technology «MISIS», Moscow
b Research and Production Corporation "Istok" named after Shokin, Fryazino, Moskovskaya obl.

Abstract: Samples of polycrystalline yttrium-iron garnet synthesized using radiation-thermal sintering and ceramic processing have been studied by the Mössbauer spectroscopy method. The best decomposition of the Mössbauer spectroscopy spectra of the research objects, which is a simulation of the experimental spectrum with five sextets, has been selected. An additional fifth sextet is caused by Fe$^{3+}$ ions, which are surrounded by oxygen vacancies leading to distortion of Fe-tetrahedra, which is reflected in an increase in the quadrupole splitting of Fe$^{3+}$. An increase in the density of $s$-electrons on Fe ions in distorted tetrahedra has been found, resulting in a decrease in the isomeric chemical shift $\delta$ of Fe ions to a value close to the $\delta$ value for Fe$^{4+}$ ions. It has been shown that the optimal crystal structure is realized in Y$_{3}$Fe$_{5}$O$_{12}$ polycrystals when they are sintered for 40–60 min in the temperature range of 1350–1400$^\circ$C by the radiation-thermal sintering method.

Keywords: Mössbauer spectroscopy, yttrium iron garnet, crystal structure, radiation thermal sintering technology, sintering temperature, ceramic technology, chemical isomeric shift, quadrupole splitting.

Received: 10.12.2019
Revised: 25.02.2020
Accepted: 25.02.2020

DOI: 10.21883/FTT.2020.07.49467.646


 English version:
Physics of the Solid State, 2020, 62:7, 1156–1164

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© Steklov Math. Inst. of RAS, 2024