非晶态Bi_(2.2)Sr_(1.8)CaCu_(1.2)Li_(0.8)O_y晶化的正电子湮没谱研究

• 作 者: 张宏 魏旺水
• 机 构: 中国科学院上海冶金研究所,中国科学院上海冶金研究所 上海 200050,上海 200050
• 出 处: 科学通报
• 发表日期: 1991年23期
• 关键词: 晶化过程 非晶态金属 Li O_y Sr Bi CaCu 正电子湮没 超导氧化物 晶态

Bi-Sr-Ca-Cu-O系超导氧化物通过熔体快速凝固极易生成非晶态,这种非超导的非晶态通过合宜的后续热处理,可以转变为具有高超导转变温度Tc的晶态相,其Tc和相似成分的粉末烧结体相近。非晶Bi系氧化物具有致密度高,成分均匀并可成型为各种形状等优点,经由非晶态转变为高超导性能的晶态已成为某些潜在的实用超导材料制备工艺的基础如

Bi-Sr-Ca-Cu-O based superconducting oxides are very easily formed into an amorphous state by rapid solidification of a melt. This non-superconductive amorphous state can be transformed into a material having a high superconducting transition temperature Tc crystalline phase, the Tc and similar components of the powder sintered body close. Amorphous Bi-based oxides have the advantages of high density, uniform composition and can be molded into various shapes and the like. Crystalline state transformed from amorphous state to high-superconductivity has become the basis of some potential manufacturing processes for practical superconducting materials Such as