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The reaction mechanism to produce the high-T c phase was investigated using X-ray powder diffractometry and thermogravimetry and differential thermal analysis (TG-DTA). The high-T c phase was produced through the low-T c phase (Bi2Sr3-x Ca x Cu2O y , 1<x<2) which was formed as an intermediate reaction product and also as a precursor of the high-T c phase. In order to produce the high-T c phase, it is necessary that the melting point of the low-T c phase be lower than that of the high-T c phase. Increase of Ca content in the low-T c phase or decrease of ambient partial oxygen pressure during calcination are quite efficient to decrease the melting point of the low-T c phase, and hence to enhance the formation of the high-T c phase.
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Tsuchiya et al. (1989) studied this question.
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