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The phase evolution in the melt of Bi2Sr x Ca3- x Cu2O z has been investigated in 0.01 atm oxygen environment. It has been found that a 4-phase equilibrium is achieved among Bi2(Sr, Ca)3O6, (Sr, Ca)CuO2, (Sr, Ca)2CuO3 and liquid in the region 1.8<x<2.1 at 850° C. On the other hand, for x=2.3, Bi2(Sr, Ca)3O6 and (Sr, Ca)CuO2 are present as solid phases, while for x=1.8, Bi2(Sr, Ca)3O6 and (Sr, Ca)2CuO3, and for x=1.6, only (Sr, Ca)2CuO3 is present. In the entire range of x, the liquid phase has a characteristic composition of Bi:(Sr+Ca)=1:1 while the content of Cu changes as x changes. The solidification of the Bi2212 phase proceeds below 840° C. The Sr/Ca ratio of the 2212 phase grown from the melt is found to be nearly equal to that of the starting material. As temperature decreases, Cu content in the liquid decreases while the ratio of Bi:(Sr+Ca) remains at 1:1.
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Masashi Yoshida (1995) studied this question.
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