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Phase Transformations in the Y2Cu2O5–BaCuO2 System

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Inorganic Materials Aims and scope

Abstract

The sequence of phase transformations in the Y2Cu2O5–BaCuO2 pseudobinary system was studied during heating and cooling in the range 1170–1310 K. The results demonstrate that the reaction zone in BaCuO2 /Y2Cu2O5 diffusion couples consists of BaCuO2/YBa2Cu3O7 – δ/Y2BaCuO5/Y2O3/Y2Cu2O5 layers, corresponding to the sequence of chemical changes during YBa2Cu3O7 – δ crystallization between 1170 and 1220 K. In the range 1260–1310 K, BaCu2O2 is formed. During cooling of a Y2Cu2O5 + 4.3BaCuO2 mixture, YBa2Cu3O7 – δ crystallizes in a wide temperature range, between 1240 and 1190 K. The process depends on the presence of BaCu2O2 on the surface of Y2BaCuO5 grains in the high-temperature solution and the oxygen supply from the gas phase.

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  1. Institute of Solid-State and Semiconductor Physics, Belarussian Academy of Sciences, ul. Brovki 17, Minsk, 220072, Belarus

    N. A. Kalanda, V. M. Trukhan & S. F. Marenkin

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  1. N. A. Kalanda
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  2. V. M. Trukhan
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  3. S. F. Marenkin
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Kalanda, N.A., Trukhan, V.M. & Marenkin, S.F. Phase Transformations in the Y2Cu2O5–BaCuO2 System. Inorganic Materials 38, 494–497 (2002). https://doi.org/10.1023/A:1015427206872

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