Positron Annihilation in Solid and Liquid Bi40Sn60 Alloy |
| St. Chabika, W. Rudzińskaa, M. Szuszkiewiczb and Cz. Szymańskia a Institute of Physics, Opole University, Oleska 48, 45-052 Opole, Poland b Institute of Experimental Physics, Wrocław University, Pl. Maxa Borna 9, 50-204 Wrocław, Poland |
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| The peak counting rate, F(T), for Bi40Sn60 alloy in the temperature range from room temperature to 400°C was measured in three consecutive heating-cooling runs. Significant changes in F(T) were observed in the temperature interval between the solidus and liquidus temperature. The magnitude of these anomalies systematically diminishes in consecutive heating-cooling runs. Noticeable changes of values of F(T) parameter in the liquid alloy were observed, too. These effects were connected with trapping of positrons at the grain boundaries-defects and in the short-range ordered regions in the liquid alloy. Also microscopic structure of sample before and after measurements cycles was observed. |
| DOI: 10.12693/APhysPolA.95.479 PACS numbers: 64.70.Dv, 61.72.Cc, 78.70.Bj |