Phase diagram of the pseudobinary BaCuO2-YBa2Cu3O6.5-YCuO2.5 system
1988; Elsevier BV; Volume: 136; Linguagem: Inglês
10.1016/0040-6031(88)87445-8
ISSN1872-762X
AutoresM. Nevřiva, E. Pollert, Jaroslav Šesták, L. Maějková, A. Tříska,
Tópico(s)Magnetic and transport properties of perovskites and related materials
ResumoThe recent discovery of high temperature superconductors has led to the study of the phase equilibria in the corresponding systems, particularly Y-Ba-Cu-O. Obviously the investigation of pseudobinary regions is a necessity for a complete understanding of such a complex system. In this work the YCuO2.5-BaCuO2 tie line, including the superconductive 1:2:3 phase, in the temperature range 900–1300 ° C at PO2 = 100 kPa was investigated using X-ray phase analysis and DTA. Samples were heated in an oxygen atmosphere at various temperatures and were subsequently quenched. The resulting pseudobinary phase diagram of the YCuO2.5-BaCuO2 system was constructed assuming that copper ions were present as Cu2+; deviations from stoichiometry were neglected.
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