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研究了Ｓｎ作Ｃｕ位元素替代的ＹＢａ２Ｃｕ３－ｘＳｎｘＯｙ超导体系（ｘ＝０－１．５）的正电子寿命谱，计算了局域电子密度和缺陷浓度的变化；发现了存在于高浓度替代区域（ｘ＝０．８－１．０）的正电子湮没特征；讨论了对超导电性的影响以及相应的物理机制。
The positron lifetime spectra of YBa2Cu3-xSnxOy superconducting system (x = 0-1.5) replaced by Cu element have been studied. The variation of local electron density and defect concentration has been calculated. (X = 0.8-1.0) positron annihilation characteristics; the impact on superconductivity and the corresponding physical mechanism are discussed.