论文部分内容阅读
在２５—２７５Ｋ范围内，测量了正电子在８０９０合金和含Ｚｎ，Ａｇ或Ｓｃ的８０９０合金的湮没寿命．结果表明，τ１＝１７５—１８７ｐｓ是典型的正电子在共格粒子δ＇（Ａｌ３Ｌｉ）上的湮没寿命；τ２对温度Ｔ有明显的依赖关系．只要同时考虑空位、晶界对τ２的影响，就可以很好地对这四种样品的τ２－Ｔ曲线作出解释，并可对空位的存在形式作出推断．
In the range of 25-275K, the annihilation lifetime of positron in 8090 alloy and 8090 alloy containing Zn, Ag or Sc was measured. The results show that τ1 = 175-187ps is the annihilation lifetime of the typical positron on the coherent particle δ ’(Al3Li); τ2 has obvious dependence on the temperature T. As long as the effects of vacancy and grain boundaries on τ2 are taken into consideration, the τ2-T curves of these four samples can be well explained and the existence of vacancies can be inferred.