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Phase Formation in the GdFeO3–SrO System at 1200–1400°С

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Abstract

The phase relations in the subsolidus region of the GdO1.5–FeO1.5–SrO system are studied at 1200–1400°C in air. The formation of three complex perovskite-like oxides is shown: GdSr2FeO5, GdSrFeO4, and Gd2SrFe2O7, crystallizing in the tetragonal syngony. These compounds lie on the binary cross section of GdFeO3–SrO of the GdO1.5–FeO1.5–SrO system, of which the last two oxides form the homologous series GdnSrFenO3n + 1, where n = 1, 2. For the first time in conditions of the solid phase synthesis of the thermal treatment of a mixture of initial oxides of gadolinium, iron (III), and strontium carbonate at 1200°C for 5 h yielded the compound GdSr2FeO5, crystallizing in the Cs3CoCl5 (sp. gr. I4/mcm) structural type. The mechanism of its formation is determined: the rate-limiting step is the reaction of the interaction of two Gd2SrO4 and Sr3Fe2O6 oxides, crystallizing into close structural types. It is shown that ferrite GdSr2FeO5 is stable in the range of investigated temperatures of 1200 to 1400°C in air.

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ACKNOWLEDGMENTS

The author thanks the Corresponding Member of the Russian Academy of Sciences V.V. Gusarov for supporting the research in the field of phase equilibria of refractory oxide systems.

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  1. Ioffe Institute, Russian Academy of Sciences, 194071, St. Petersburg, Russia

    E. A. Tugova

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Tugova, E.A. Phase Formation in the GdFeO3–SrO System at 1200–1400°С. Glass Phys Chem 48, 614–621 (2022). https://doi.org/10.1134/S1087659622600454

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