Phase equilibria, crystal structure and oxygen nonstoichiometry of complex oxides formed in the system GdCoO3–SrCoO3–δ–SrFeO3–δ–GdFeO3
- Authors: Aksenova Т.V.1, Solomakhina E.E.1, Urusova A.S.1, Cherepanov V.A.1
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Affiliations:
- Yeltsin Ural Federal University
- Issue: Vol 69, No 7 (2024)
- Pages: 1052-1062
- Section: ФИЗИКО-ХИМИЧЕСКИЙ АНАЛИЗ НЕОРГАНИЧЕСКИХ СИСТЕМ
- URL: https://journals.rcsi.science/0044-457X/article/view/274387
- DOI: https://doi.org/10.31857/S0044457X24070142
- EDN: https://elibrary.ru/XNGEUJ
- ID: 274387
Cite item
Abstract
The phase equilibria in the quasi-quaternary GdCoO3–SrCoO3–δ–SrFeO3–δ–GdFeO3 system have been studied at 1373 K in air. The homogeneity ranges and crystal structure of solid solutions of general composition Gd1–xSrxCo1–yFeyO3–δ have been determined. Depending on the concentration of introduced strontium and iron, the Gd1–xSrxCo1–yFeyO3–δ oxides crystallize in orthorhombic (x = 0.1 and 0.4 ≤ y ≤ 1.0; x = 0.2 and y = 0.9, sp. gr. Pbnm), tetragonal (0.6 ≤ x ≤ 0.8 and 0.1 ≤ y ≤ 0.5, sp. gr. I4/mmm) or cubic (x = 0.9 and 0.1 ≤ y ≤ 0.9; 0.6 ≤ x ≤ 0.8 and 0.6 ≤ y ≤ 0.9, sp. gr. Pm-3m) perovskite structure. Structural parameters were determined for all single-phase samples. An increase in the concentration of strontium and iron leads to an increase in the unit cell parameters of the Gd1–xSrxCo1–yFeyO3–δ oxides. It has been shown that the oxygen content in Gd1–xSrxCo1–yFeyO3–δ cobaltites, determined by thermogravimetric analysis, decreases with increasing temperature and strontium content in the samples. An isobaric-isothermal phase diagram of the GdCoO3 – SrCoO3–δ–SrFeO3–δ–GdFeO3 system at 1373 K in air was constructed.
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About the authors
Т. V. Aksenova
Yeltsin Ural Federal University
Author for correspondence.
Email: TV.Aksenova@urfu.ru
Russian Federation, Ekaterinburg, 620002
E. E. Solomakhina
Yeltsin Ural Federal University
Email: TV.Aksenova@urfu.ru
Russian Federation, Ekaterinburg, 620002
A. S. Urusova
Yeltsin Ural Federal University
Email: TV.Aksenova@urfu.ru
Russian Federation, Ekaterinburg, 620002
V. A. Cherepanov
Yeltsin Ural Federal University
Email: TV.Aksenova@urfu.ru
Russian Federation, Ekaterinburg, 620002
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