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研究了T*相超导体（Bi，Sr）2（Y，Ce）2Cu2Oy的成相规律，发现缓冷对T*相单相样品的制备是有利的．淬火样品的主相物质为Ce2Y2O7，完全不含T*相结构．在室温到熔化温度的范围，热分析未观察到结构相变．在240—460℃，相对每个Cu原子超导体失氧约0.1个氧．氧气中烧结并缓冷到室温的样品在30K出现零电阻现象The optimal synthesis of T* phase superconductors(Bi0.5Sr1.5)(Y,Ce)2Cu2Oy was studied in detail. Slow cooling was required for preparation of single phase T*-type compounds. After quenching,the samples contained Ce2Y2O7 as the major phase without T* structure presented. From room temperature to 1000℃ phase transition was not observed by thermal analysis. Upon slow cooling in oxygen, T*-type cuprates exhibited zero resistance at 30K.
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