摘要
对Ｌａ１＋ ｚＢａ２－ ｚＣｕ３Ｏｙ 相的形成、固溶度和Ｌａ 对Ｂａ 的替代进行了系统研究，以期获得制备具有更高Ｔｃ 的超导体的最佳条件．实验表明Ｌａ１＋ ｚＢａ２－ ｚＣｕ３Ｏｙ 在空气中固溶度为０．２０～０．７０，Ｎ２ 中为０．在空气中合成Ｌａ１＋ ｚＢａ２－ ｚＣｕ３Ｏｙ 时，Ｌａ 能替代Ｂａ，但Ｂａ并不能替代Ｌａ，空气和Ｏ２有利于Ｌａ 对Ｂａ 的替代，但当在Ｎ２ 中合成Ｌａ１＋ ｚＢａ２－ ｚＣｕ３Ｏｙ 时，Ｌａ 对Ｂａ的替代受到抑制．结果表明：在Ｎ２ 中烧结和冷却是制备的具有更高Ｔｃ 的单相ＬａＢａ２Ｃｕ３Ｏｙ 超导体的关键步骤之一．
The phase formation,solid solution range and the substitution of La for Ba of La 1+z Ba 2-z Cu 3O y are investigated systematically for obtaining and understanding the optimum condition for preparing La123 superconductor with higher T c. The solid solution range of La 1+z Ba 2-z Cu 3O y are z =0.20～0.70 in air and z =0 in N 2.La can substitute for Ba,but Ba can not for La in La 1+z Ba 2-z Cu 3O y in air or O 2.Atmosphere of O 2 or air is favorable for the substitution of La for Ba.The substitution is suppressed when La 1+z Ba 2-z Cu 3O y are sintered and cooled in N 2.It is found that sintering and cooling procedure in N 2 atmosphere is one key procedure to prepare single phase high quality La123 superconductor with higher T c.
出处
《四川大学学报（自然科学版）》
CAS
CSCD
北大核心
1999年第5期886-891,共6页
Journal of Sichuan University(Natural Science Edition)
