Local environment of 119Sn4+ probe ions in the bulk and on the surfaces of substituted chromites with perovskite-type structure Y1-xCaxCrO3

Pavel B. Fabritchnyi (1) , Mikhail I. Afanasov (1) , Evgueny Mezhuev (1) , Alain Wattiaux (2) , Christine Labrugère (3) , Claude Delmas (2)

1 Department of Chemistry
2 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux
3 PLACAMAT - Plateforme Aquitaine de Caractérisation des Matériaux

A specific feature of the Mössbauer spectra of 119Sn in Y1–xCaxCrO3 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.

Domaines: Matériaux

Pavel B. Fabritchnyi, Mikhail I. Afanasov, Evgueny Mezhuev, Alain Wattiaux, Christine Labrugère, et al.. Local environment of 119Sn4+ probe ions in the bulk and on the surfaces of substituted chromites with perovskite-type structure Y1-xCaxCrO3. Bulletin of the Russian Academy of Sciences - Physics, 2015, 79 (8), pp.1046-1050. ⟨10.3103/S1062873815080055⟩. ⟨hal-01201048⟩