Local environment of 119Sn4+ probe ions in the bulk and on the surfaces of substituted chromites with perovskite-type structure Y1–x Ca x CrO3
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A specific feature of the Mössbauer spectra of 119Sn in Y1–x Ca x CrO3 samples containing 0.3 at % Sn4+ in the bulk of crystallites is an extra sextet component corresponding to hyperfine field H(119Sn) = 65 kOe at 4.2 K. This effect is explained by the formation of Sn4+ impurity associates in the chromium sublattice. A drastic weakening in spin polarization is observed for the Sn4+ ions in surface sites, but is found not to be related to the presence of heterovalent Ca2+ ions.
KeywordsChromite Spin Polarization Crystallite Surface 119Sn Nucleus Probe Cation
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