Abstract

TG measurements of the univariant reactions in the Y-Ba-Cu-O system at 0.21×10 5 Pa O 2 pressure indicate that independently of temperature and coexisting solid phases the melt composition corresponds to a YO 1.5 -BaO-CuO 0.68 section. This behaviour is quite similar to the binary Cu-O system. Consequences for techniques of YBa 2 Cu 3 O 7-δ synthesis involving melts are discussed

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