Abstract
Abstract Results are reported from small-angle neutron scattering (SANS) and Mossbauer spectrometry measurements on four Ni3Fe materials: nanocrystalline material prepared by mechanical attrition, nanocrystalline material after an exposure to 4K, nanocrystalline material after a heat treatment of 100°C for 10 days, and a control sample composed of large crystals. Scattering from the nanocrystalline materials after thermal treatments showed changes in the intensity and the slope of both the nuclear and the magnetic scattering profiles of the SANS measurements. The Mossbauer spectra from the nanocrystalline samples showed changes in the hyperfine fields associated with grain-boundary atoms. The changes induced by cryogenic exposure and annealing at 100°C were somewhat different but were consistent with a sharper density gradient between the crystalline region and the grain-boundary region. Some grain-boundary atoms in mechanically attrited Ni3Fe are in energetically unfavourable positions, and move into new...
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