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Positron Annihilation in Solid and Liquid Bi_{40}Sn_{60} Alloy

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Chabik S., Rudzińska W., Szuszkiewicz M., Szymański C.

Acta Physica Polonica A

1999

vol. 95

issue 4

479-482

The peak counting rate, F(T), for Bi_{40}Sn_{60} 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.

Positron Annihilation in Pure and Hydrogenated Palladium Deformed by Uniaxial Tension

100%

Rudzińska W., Pająk J., Szymański C., Szatanik R.

Acta Physica Polonica A

2001

vol. 99

issue 3-4

479-486

Angular distributions of the positron annihilation quanta were measured for pure and hydrogenated palladium samples deformed by uniaxial tension up to different deformation degrees. The relative difference curves, and the values of the R parameter characterizing the dimensions of defects trapping the positrons, were determined. It was found that for relative elongations ranging from 1.9 to 3.5%, in both the pure and hydrogenated palladium, the positrons are trapped in defects larger than vacancy clusters. The values of the R parameter for pure palladium samples elongated up to 0.39, 0.77, and 1.5% indicate a dominant role of smaller defects, like the vacancy clusters.

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2 Acta Physica Polonica A

1 2001

1 1999

2 Rudzińska W.

2 Szymański C.

1 Chabik S.

1 Pająk J.

1 Szatanik R.

1 Szuszkiewicz M.

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Positron Annihilation in Solid and Liquid Bi_{40}Sn_{60} Alloy

Positron Annihilation in Pure and Hydrogenated Palladium Deformed by Uniaxial Tension