Site distribution and hyperfine parameters of tin impurities in α manganeseстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Dilute alloys of 0.1-0.5 at.% of enriched Sn-119 in alpha manganese were transformed to hydrides with hcp, fee and beta-Mn structures by exposure to pressures of molecular hydrogen up to 3 GPa at elevated temperatures and subsequent quenching to room temperature. The samples were then transformed back to alpha-Mn(Sn) by hot extraction of the hydrogen at temperatures up to 400 degrees C. Sn-119 Mossbauer spectra taken after hydrogen extraction differed considerably from those taken before the hydrogen treatment. This observation is interpreted by a strongly different distribution of Sn atoms over the four crystallographically inequivalent sites in the alpha-Mn structure before and after the treatment. A quantitative evaluation of the Mossbauer spectra yields the hyperfine parameters of Sn-119 on all Mn sites and shows that the preferred tin site is the Mn-I position in the alpha-Mn structure.