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Phase Equilibria and Structure of Complex Oxides in the 1/2 Nd2O3–CaO–CoO System in Air at 1373 K

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Abstract

X-ray powder diffraction and Rietveld full-profile analysis are used to establish the homogeneity ranges and crystalline structure of solid solutions Nd2−zCazO3−z/2 (0.0 ≤ z ≤ 0.1, space group P\(\bar {3}\)m1) and Nd2−yCayCoO4−δ (0.7 ≤ y ≤ 1.0, space group I 4/mmm). Dependences of the unit cell parameters on the composition of solid solution Nd2−yCayCoO4−δ are obtained. It is shown that all cobaltites Nd2−yCayCoO4−δ in the temperature range of 298–1373 K in air possess virtually stoichiometric composition. Average values of thermal expansion coefficients for Nd2−yCayCoO4−δ (y = 0.8; 0.9) are calculated. An isobaric-isothermal section of the phase diagram for the 1/2Nd2O3–CaO–CoO system at 1373 K in the air has been constructed.

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ACKNOWLEDGMENTS

This work was supported by the RF Ministry of Science and Higher Education, project no. FEUZ-2020-0052; and by RF Government Program 211, contract no. 02.A03.21.0006.

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Authors and Affiliations

  1. Yeltsin Ural State University, 620075, Yekaterinburg, Russia

    T. V. Aksenova, A. S. Urusova & V. A. Cherepanov

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  1. T. V. Aksenova
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  2. A. S. Urusova
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  3. V. A. Cherepanov
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Correspondence to T. V. Aksenova.

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Translated by M. Drozdova

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Aksenova, T.V., Urusova, A.S. & Cherepanov, V.A. Phase Equilibria and Structure of Complex Oxides in the 1/2 Nd2O3–CaO–CoO System in Air at 1373 K. Russ. J. Phys. Chem. 94, 2495–2501 (2020). https://doi.org/10.1134/S0036024420120031

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