Abstract
A study was made of lattice defects in hep Co metal using the technique of perturbed γ-γ angular correlations. Lattice sites of111Cd impurities were characterized by their nuclear magnetic dipole and electric quadrupole interaction frequencies, respectively ωL and ωO. The signal for defect-free substitutional Cd impurities was found to have collinear interactions at 77K, with ωL=438 Mrad/s and ωO=7 Mrad/s. Analysis of measurements after heavy deformation at 100 K and after annealings up to 700 K gave little evidence of thermal trapping of point defects. However, in all spectral measured after deformation, a highly stable defect site with ωL=418 and ωO Mrad/s, and showing collinear interactions, was also observed. It is attributed to a111Cd probe in a stacking fault (SF). Assuming a random distribution of proble atoms and SF's, a SF density of 20% was estimated.
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Supported in part by National Science Foundation grant DMR 86-19688 (Mctallurgy Program).
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McGhee, G., Collins, G.S. Stacking fault defects in hep cobalt studied by PAC. Hyperfine Interact 60, 659–662 (1990). https://doi.org/10.1007/BF02399839
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DOI: https://doi.org/10.1007/BF02399839