Abstract
Thin films of nickel were irradiated by fast neutrons at 45 and 59 deg C to 3.38 x l0/sup 17/ and 9.45 x l0/sup 15/ nvt, respectively. As a result of fast-neutron irradiation to 3.35 x 10/sup 17/ nvt, films of nickel were transformed from face-centered cubic to close-packed hexagonal lattices with a = 2.62 A and c = 4.36 A. For samples irradiated to 9.45 x l0/sup 15/ nvt, both face- centered cubic and close-packed hexagonal lattices were obtained. For samples transformed into closepacked hexagonal lattices, the magnetic properties disappeared and the coercive force fell from H/sub c/ = 240 to H/sub c/ = 0 oersted. The samples in which part transformed into hexagonal lattices showed a drop in magnetization of about 30 to 50% and their coercive force increased to a certain extent. Samples irradiated in oxygen revealed a more ordered structure after irradiation with the hysteresis cycle more rounded. (C.J.G.)
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