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Mass density of glassy Pd_(80)Si_(20) during low-temperature light ion irradiation

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Changes in mass density of amorphous Pd_(80)Si_(20) were monitored in situ during irradiation with He~(2+) and H~+ ions at temperatures below 100 K and during subsequent thermal treatment. The mass density decreased with increasing ion fluence and exponentially approached a saturation value of -1.2 percent, corresponding to a recombination volume of 190 atomic volumes. The initial swelling rate was 2.3 atomic volumes/displaced atom. The mass density of the irradiated material increased during subsequent thermal treatment, and the irradiation-induced decrease of the mass density recovered completely at room temperature.

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