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Phase equilibria at 1100°C in air and crystal structure of solid solutions in the system LaCoO3—SrCoO2.5—“SrNiO3”—“LaNiO3”

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Abstract

Phase equilibria in the LaCoO3—SrCoO2.5—“SrNiO3”—“LaNiO3” system are studied at 1100°C in air using samples prepared by standard solid-state reactions and by the citrate route. The composition region and structure of La1 − xSr x Co1 − yNi y O3 − δ solid solutions are determined by x-ray powder diffraction. The structure is refined by the Rietveld profile analysis method with Fullprof 2002. The solid solutions with 0< x ≤0.5 have a rhombohedrally distorted perovskite structure (sp. gr.R\( \bar 3 \)c). The rhombohedral distortion decreases with increasing Sr content, and the solid solutions with x > 0.5 have an ideal cubic structure (sp. gr. Pm3m). The composition dependences of lattice parameters for the La1 − xSr x Co1 − yNi y O3 − δ solid solutions are presented.

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Authors and Affiliations

  1. Gorki State University, pr. Lenina 51, 620083, Yekaterinburg, Russia

    T. V. Aksenova, L. Ya. Gavrilova & V. A. Cherepanov

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  1. T. V. Aksenova
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  2. L. Ya. Gavrilova
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  3. V. A. Cherepanov
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Translated from Neorganicheskie Materialy, Vol. 40, No. 12, 2004, pp. 1520–1525.

Original Russian Text Copyright © 2004 by Aksenova, Gavrilova, Cherepanov.

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Aksenova, T.V., Gavrilova, L.Y. & Cherepanov, V.A. Phase equilibria at 1100°C in air and crystal structure of solid solutions in the system LaCoO3—SrCoO2.5—“SrNiO3”—“LaNiO3”. Inorg Mater 40, 1336–1340 (2004). https://doi.org/10.1007/s10789-005-0021-4

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  • DOI: https://doi.org/10.1007/s10789-005-0021-4

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