Electronic state and local surrounding of 119Sn in calcium-substituted holmium orthochromites
| hal.structure.identifier | Faculty of Materials Science | |
| dc.contributor.author | MEZHUEV, E.M. | |
| hal.structure.identifier | Department of Chemistry | |
| dc.contributor.author | AFANASOV, Mikhail I. | |
| hal.structure.identifier | Faculty of Materials Science | |
| dc.contributor.author | LARIONOV, D.S. | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | WATTIAUX, Alain | |
| hal.structure.identifier | Plateforme Aquitaine de Caractérisation des Matériaux [PLACAMAT] | |
| dc.contributor.author | LABRUGÈRE, Christine | |
| hal.structure.identifier | Department of Chemistry | |
| dc.contributor.author | FABRITCHNYI, Pavel B. | |
| dc.date.issued | 2017-10 | |
| dc.identifier.issn | 0036-0236 | |
| dc.description.abstractEn | The influence of Ca2+ doped into the holmium sublattice on the magnetically active surrounding of Sn4+ ions located in the chromium sublattice of Ho1–xCaxCr0.997Sn0.003O3 (x = 0, 0.003, and 0.1) compounds was studied by 119Sn Mössbauer spectroscopy. At concentrations [Ca] = [Sn] = 0.3 mol %, an increase was observed in the spectral contribution of Sn4+ sites, having the full number of nearest-neighbor Cr3+cations (n = 6), where they perceived a magnetic field H(Sn)4.2 K = 82 kOe, compared to the contribution of the relevant sites in the undoped chromite (x = 0). This observation was interpreted as resulting from a reduced probability of appearance of Cr3+ vacancies in the nearest surrounding of heterovalent Sn4+ ions. For x = 0.1, on the contrary, the 119Sn spectrum revealed a reduced contribution from the Sn4+ sites with n = 6. This evolution is shown not to be due neither to the appearance of Cr4+ nor Cr6+ ions in the nearest neighborhood of Sn4+ in the chromium sublattice to balance the charge deficiency of the Ca2+ ions doped into the holmium sublattice. This allowed us to suggest that the observed effect was due to the onset of Sn4+ segregations in the structure of Ho0.9Ca0.1Cr0.997Sn0.003O3, which contained a far greater amount of Ca2+ ions whose charge deficiency was balanced mostly by Cr4+ formation. Studies of samples that were prepared under a hydrogen atmosphere revealed the reduction of Sn4+ to the oxidation state +2, with the concomitant stabilization of the formed Sn2+ ions on crystallite surfaces on sites having low coordination numbers. | |
| dc.language.iso | en | |
| dc.publisher | MAIK Nauka/Interperiodica | |
| dc.title.en | Electronic state and local surrounding of 119Sn in calcium-substituted holmium orthochromites | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1134/S0036023617100126 | |
| dc.subject.hal | Chimie/Matériaux | |
| bordeaux.journal | Russian Journal of Inorganic Chemistry / Zhurnal Neorganicheskoi Khimii | |
| bordeaux.page | 1384-1389 | |
| bordeaux.volume | 62 | |
| bordeaux.issue | 10 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-01676296 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-01676296v1 | |
| bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Russian%20Journal%20of%20Inorganic%20Chemistry%20/%20Zhurnal%20Neorganicheskoi%20Khimii&rft.date=2017-10&rft.volume=62&rft.issue=10&rft.spage=1384-1389&rft.epage=1384-1389&rft.eissn=0036-0236&rft.issn=0036-0236&rft.au=MEZHUEV,%20E.M.&AFANASOV,%20Mikhail%20I.&LARIONOV,%20D.S.&WATTIAUX,%20Alain&LABRUG%C3%88RE,%20Christine&rft.genre=article |
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