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In the synthesis of the superconducting compound Ba 2 YCu 3 O 7‐x from a stoichiometric mixture containing BaCO 3 , Y 2 O 3 , and CuO In air, a low‐melting liquid phase is formed at about 890°C. The liquid phase was identified as a ternary eutectic located within the compatibility triangle Ba 2 YCu 3 O 7‐x –BaCuO 2 –CuO. The implication of this finding for the processing of Ba 2 YCu 3 O 7‐x is discussed.
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J. P. Guha (1988) studied this question.
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