Abstract
AbstractThe formation of thermal vacancies in Cu3Sn has been investigated by using positron annihilation lifetime spectroscopy. Positron lifetime measurement was performed in‐situ between 293 K and 673 K. The positron lifetime below 433 K was found to be about 140 ps, which indicates that there are no detectable vacancies below 433 K. A sharp increase of the mean positron lifetime τm, which is due to thermal vacancy formation, starts around 453 K and the saturation trapping of positrons by thermal vacancies are observed above 633 K. The Arrhenius plot of the positron trapping rate, which is proportional to the vacancy concentration, represents a linear behavior and the vacancy formation enthalpy was determined to be 0.63±0.02 eV. This value is relatively low comparing with that expected from the melting temperature (950 K) of this alloy. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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