摘要
研究了Y_(1-x)Ca_xBa_2Cu_3O_(7-y)系超导材料,当x≤0.15时,钙离子部分置换了123相中钇离子而形成固溶体,导致正交相晶胞参数稍微增大。钙含量增加,三价铜的含量上升,T_c却下降。由于钙离子取代钇离子后主要影响邻近的Cu(2)-O层的性质,这说明Cu(2)-O层的性质对超导电性起了很重要的作用。
A series of Y_(1-x)Ca_xBa_2Cu_3O_(7-y) superconductor have been investigated. For x≤0. 15,the Y^(3+) is replaced by Ca^(2+) in 123 phase and the solid solutions are formed. That leads tothe slight increase of the lattice parameters of orthorhombic phase. When the contents ofCa increase, the contents of Cu^(3+) increase but their T_c decrease. It is considered that theproperties of neighboring Cu(2)-O plane are affected, when the Y^(3+) is substituted by Ca^(2+)then it results in the T_c dropping. It is shown that the properties of Cu(2)-O plane are veryimportant to superconductivity.
出处
《应用化学》
CAS
CSCD
北大核心
1990年第5期54-57,共4页
Chinese Journal of Applied Chemistry
基金
国家自然科学基金
