抄録
Measurements of positron lifetimes in SexTe1−x alloys with x=0, 0.2, 0.4 and 0.6 have been carried out as a function of temperature. The lifetimes show large increments on melting and increase with temperature and Se concentration. The temperature dependence of lifetime is closely related to the change in the density. The results suggest that the annihilation characteristics of the trapped positrons are affected by the change in the bonding character. The dependence of lifetime on temperature and concentration is qualitatively explained provided the two kinds of the trapping sites are taken into account in the liquid Se–Te alloys.
