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hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorKIM, Seung-Joo
hal.structure.identifierInstituto de Ciencia de Materiales de Madrid [ICMM]
dc.contributor.authorMARTÍNEZ-LOPE, M. J.
hal.structure.identifierInstitut Laue-Langevin [ILL]
dc.contributor.authorFERNÁNDEZ-DÍAZ, M. T.
hal.structure.identifierInstituto de Ciencia de Materiales de Madrid [ICMM]
dc.contributor.authorALONSO, J. A.
hal.structure.identifierMoscow State University
dc.contributor.authorPRESNIAKOV, Igor A.
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorDEMAZEAU, Gérard
dc.date.issued2002
dc.identifier.issn0897-4756
dc.description.abstractEnTlNiO3 has been prepared under high oxygen pressure. This perovskite has been characterized by high-resolution neutron powder diffraction (NPD), Mössbauer spectroscopy, and magnetic measurements. The crystal structure was refined in the monoclinic P21/n space group, containing two crystallographic sites for Ni3+, in such a way that expanded and contracted NiO6 octahedra alternate along the three crystallographic directions. In this model the agreement factors are significantly better than those obtained after the refinement of the structure in the conventional space group Pbnm (orthorhombic symmetry). TlNiO3 becomes antiferromagnetically ordered below TN = 104 K. The low-temperature (2 K) magnetic structure, also studied from NPD data and characterized by a propagation vector k = (1/2, 0, 1/2), is similar to that observed for YNiO3, and it is compatible with this two-sites model. A Mössbauer study of TlNi0.9857Fe0.02O3 confirms the existence of two octahedral sites for 57Fe3+. All these results are in agreement with a Ni3+ disproportionation (2Ni3+ → Ni(3+α) + Ni(3-α)+) phenomenon, already suggested for other ANiO3 (A = rare earths or Y) perovskites through neutron diffraction data.
dc.language.isoen
dc.publisherAmerican Chemical Society
dc.subject.enHigh pressure
dc.subject.enOxygen
dc.subject.enInorganic compounds
dc.subject.enTlNiO3
dc.title.enEvidence of Ni(III) disproportionation in the TlNiO3 perovskite lattice through neutron powder diffraction and Mössbauer spectroscopy
dc.typeArticle de revue
dc.identifier.doi10.1021/cm021157o
dc.subject.halChimie/Matériaux
bordeaux.journalChemistry of Materials
bordeaux.page4926-4932
bordeaux.volume14
bordeaux.issue12
bordeaux.peerReviewedoui
hal.identifierhal-00818193
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00818193v1
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