Abstract

Positron lifetime measurements were performed on crystalline Co and amorphous Co-P alloys produced by electrodeposition. The lifetime spectra of the amorphous alloys consisted of only one component whose value ranged between 154 and 168 p.s. over the range 17-30 at.% P while those of the electrodeposited Co showed two components, the longer one attributed to trapped positrons in voids. The results showed a relationship between the mean positron lifetime of the amorphous alloy and its P concentration. Analysing the spectra by the RATIO method, the results suggest positron trapping in empty large Bernal holes of the DRP structure of the metallic atoms and in structural defects associated with a metalloid atom lodged in a small Bernal hole. The analysis of the amorphous alloy spectra suggests that a small fraction of positrons annihilate from free states.

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