Abstract
In order investigate the structural dependence of defect formation during irradiation, amorphous Fe79B16Si5 alloy and crystalline FeBSi alloy were irradiated by 300 keV helium ions at room temperature. Positron annihilation lifetimes observed for the unirradiated amorphous and the crystalline FeBSi alloys were nearly equal, i.e., 124.4±0.3 ps and 124.6±0.2 ps, respectively. The S parameters of the Doppler-broadening of annihilation radiation measured using a positron beam were also similar for the unirradited amorphous and crystalline FeBSi alloys. It means that the positron annihilation at the free volume in amorphous Fe79B16Si5 alloy is not prominent. The Doppler-broadening S parameter increased after the helium irradiation. This phenomenon was more pronounced in the amorphous FeBSi alloy. It suggests that the atoms are more easily displaced in amorphous alloy than in crystalline alloy during irradiation.
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