Effect of heterovalent substitutions in yttrium chromite on the hyperfine interactions of 119Sn4+ studied by Mössbauer spectroscopy

Pavel B. Fabritchnyi (1) , Mikhail I. Afanasov (1) , Evgeny M. Mezhuev (1) , Alain Wattiaux (2) , Mathieu Duttine (2) , Christine Labrugère (3)

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

In order to develop the 119Sn Mössbauer spectroscopic probe technique to study magnetically ordered materials, three Ca-substituted yttrium chromites, i.e. Y0.9Ca0.1CrO3, Y0.9Ca0.1Cr0.9Ti0.1O3 and Y0.8Ca0.2Cr0.8Ti0.2O3, doped with 0.3 atom-% Sn4+, were for the first time investigated. 119Sn Mössbauer spectra, recorded at 4.2 K, have allowed, through analysis of the magnetic hyperfine field values, probed by 119Sn nuclei, to gain insight into the local magnetically active surrounding of different Sn4+ ions. In all of these compounds, partial segregation of Sn4+ ions is revealed. In the case of Y0.9Ca0.1CrO3, neither highly oxidized Cr4+ nor Cr6+ species, expected to compensate for the Ca2+ positive charge deficit, is found in the vicinity of the 119Sn4+ probe. In the case of both studied Ti-containing chromites, 119Sn Mössbauer spectra have provided the original indirect evidence for the statistical distribution of Cr3+ and Ti4+ ions over the octahedral sites and permitted characterization of the occurring associates of Sn4+.

Mots clés: Calcium substituted chromites; Charge compensation mechanisms; X-ray photoelectron spectroscopy; Local surrounding of the 119Sn probe; B-cations' distribution; Segregation of Sn4+ dopant ions

Domaines: Matériaux

Pavel B. Fabritchnyi, Mikhail I. Afanasov, Evgeny M. Mezhuev, Alain Wattiaux, Mathieu Duttine, et al.. Effect of heterovalent substitutions in yttrium chromite on the hyperfine interactions of 119Sn4+ studied by Mössbauer spectroscopy. Journal of Solid State Chemistry, 2016, 235, pp.154-159. ⟨10.1016/j.jssc.2015.12.032⟩. ⟨hal-01281216⟩