Abstract

Ni/sub 1-//sub x/B/sub x/ amorphous films prepared by room-temperature ion implantation in the concentration range 0.20less than or equal toxless than or equal to0.34 are irradiated at 20 K with 100-keV /sup 1/H and 510-keV /sup 86/Kr ions. The radiation damage is studied at 4.2 K by in situ resistivity experiments and during annealing up to 325 K. It is shown that the nature of the damage depends on the alloy composition. At low B content the increase of resistivity is interpreted in terms of localized defect creation, while at high B content the decrease of resistivity is ascribed to the creation of disordered zones (i.e., free volume). The latter process is enhanced when displacement cascades are induced by irradiation.

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