A positron annihilation study of the annealing of electron irradiated molybdenum

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Abstract
10 MeV electrons were used from room temperature up to 1000 degrees C. In addition the recovery was monitored by resistivity measurements and transmission electron microscope observations. There is strong evidence that the stage III annealing (150- degrees C-350 degrees C) is a result of vacancy migration leading to the formation of voids which coarsen at the higher temperatures. The presence of voids was confirmed by transmission electron microscopy on material annealed to 900 degrees C. The information obtained was the result of a very careful data analysis which is described in some detail, especially regarding angular correlation curves. It shows that the often used one-parameter analysis may be misleading. The positron lifetime and angular correlation results compared in the framework of the 'trapping model' show very good agreement.