Abstract
By use of nuclear-\ensuremath{\gamma}-ray-resonance spectroscopy (NGRS), we have investigated the structure and dynamic and electronic properties of impurity states localized in the grain-boundary (GB) core and regions of nanometer-sized-polycrystalline palladium adjacent to it. It is shown that during diffusive introduction of $^{57}\mathrm{Co}$ into nanometer-sized-polycrystalline Pd, the atomic probes populate two discrete states: substitutional sites in the Pd lattice and interstitial-like positions in the GB core. It is shown that the GB properties of nanometer-sized-polycrystalline Pd are practically the same as those of polycrystals of Pd, but volume properties of the crystallites differ essentially. The reasons for this difference between the nanometer-sized-polycrystalline and polycrystalline materials are discussed.
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