Phase equilibria in the YFeO 3  – YСoO 3  system in air

A. V. Bryuzgina; A. S. Urusova; I. L. Ivanov; V. A. Cherepanov

doi:10.15826/chimtech.2021.8.1.08

Phase equilibria in the YFeO₃ – YСoO₃ system in air

A. V. Bryuzgina, A. S. Urusova, I. L. Ivanov, V. A. Cherepanov

Abstract

YFe_1-xСо_xO₃ solid solutions were prepared by glycerol-nitrate technique. The homogeneity range of solid solutions was studied within the temperature range 1173 – 1573 K. A continues series of solid solution below the decomposition temperature of YСоO₃, which was shown to be equal to 1266 ± 6 K, begins to narrow at higher temperatures and becomes equal to 0 ≤ x ≤ 0.1 at 1573 K. The phase diagram of the YFeO₃ – YСoO₃ system in the “T – composition” coordinates was divided into three fields. Similar to the parent ternary oxides, all single-phase YFe_1-xСо_xO₃ solid solutions possess orthorhombically distorted perovskite structure (Pnma space group). Unusual behavior of orthorhombic distortions in YFe_1-xСо_xO₃ with temperature was explained by probable changes in spin state of Co³⁺ ions.

Keywords

solid solutions; perovskite crystal structure; phase diagram

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References

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DOI: https://doi.org/10.15826/chimtech.2021.8.1.08

Copyright (c) 2021 A.V. Bryuzgina, A.S. Urusova, I.L. Ivanov, V.A. Cherepanov