利用正电子湮没和X-射线衍射技术,对Ni替代的YBa2Cu3-xNixO7-δ(x=0.0~0.5)超导体系进行了系统研究,分析了体系的精细结构和正电子寿命参数的变化特征,给出了Ni替代位置在Cu(1)和Cu(2)位之间的可能转移以及与正电子寿命参数之间的关联.结果表明,在小替代浓度下,Ni主要占据Cu(2)位,随替代含量的增加,出现部分Ni向Cu(1)位转移,进一步增大Ni替代含量(x≥0.2),则出现部分Ni在Cu(1)和Cu(2)位之间随机分布,并伴随有杂相出现.同时,讨论了Ni对超导电性抑制的磁散射机理及其解释.
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