Magnetocrystalline interactions and oxidation state determination of Mn(2-x)V(1+x)O4 (x=0, 1/3 and 1) magnetorresistive spinel family

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dc.contributor.authorPomiro, F.
dc.contributor.authorCeppi, S.
dc.contributor.authorDe Paoli, J. M.
dc.contributor.authorSanchez, R. D.
dc.contributor.authorMesquita, A. [UNESP]
dc.contributor.authorTirao, G.
dc.contributor.authorPannunzio Miner, E. V.
dc.contributor.institutionUniv Nacl Cordoba
dc.contributor.institutionUniv Nacl Cuyo
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-12-03T13:08:57Z
dc.date.available2014-12-03T13:08:57Z
dc.date.issued2013-09-01
dc.description.abstractOxidation states of transition metal cations in spinels-type oxides are sometimes extremely difficult to determine by conventional spectroscopic methods. One of the most complex cases occurs when there are different cations, each one with several possible oxidation states, as in the case of the magnetoresistant Mn(2-x)V(1+x)O4 (x=0, 1/3 and 1) spinel-type family. In this contribution we describe the determination of the oxidation state of manganese and vanadium in Mn(2-x)V(1+x)O4 (x=0, 1/3,1) spinel-type compounds by analyzing XANES and high-resolution K beta X-ray fluorescence spectra. The ionic models found are Mn22+V4+O4, Mn5/32+V4/33.5+O4 and Mn2+V23+O4. Combination of the present results with previous data provided a reliable cation distribution model. For these spinels, single magnetic electron paramagnetic resonance (EPR) lines are observed at 480 K showing the interaction among the different magnetic ions. The analysis of the EPR parameters show that g-values and relative intensities are highly influenced by the concentration and the high-spin state of Mn2+. EPR broadening linewidth is explained in terms of the bottleneck effect, which is due to the presence of the fast relaxing V3+ ion instead of the weak Mn2+ (S state) coupled to the lattice. The EPR results, at high temperature, are well explained assuming the oxidation states of the magnetic ions obtained by the other spectroscopic techniques. (c) 2013 Elsevier Inc. All rights reserved.en
dc.description.affiliationUniv Nacl Cordoba, INFIQC CONICET, Dept Fisicoquim, Fac Ciencias Quim, RA-5000 Cordoba, Argentina
dc.description.affiliationUniv Nacl Cordoba, IFEG CONICET, RA-5000 Cordoba, Argentina
dc.description.affiliationUniv Nacl Cordoba, Fac Matemat Astron & Fis, RA-5000 Cordoba, Argentina
dc.description.affiliationUniv Nacl Cuyo, Ctr Atom Bariloche, Comis Nacl Energia Atom, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina
dc.description.affiliationUniv Nacl Cuyo, Inst Balseiro, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina
dc.description.affiliationUniv Estadual Paulista, Inst Geociencias & Ciencias Exatas, BR-13506900 Rio Claro, Sao Pablo, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Inst Geociencias & Ciencias Exatas, BR-13506900 Rio Claro, Sao Pablo, Brazil
dc.description.sponsorshipLNLS-Brazilian Synchrotron Light Laboratory
dc.description.sponsorshipConsejo Nacional de Investigaciones Cientificas y Tecnicas (CONICET)
dc.description.sponsorshipAgencia Nacional de promocion cientifica y tecnologica (ANPCyT)
dc.description.sponsorshipSecretaria de Ciencia y Tecnologia de la Universidad Nacional de Cordoba (UNC)
dc.description.sponsorshipIdLNLS-Brazilian Synchrotron Light LaboratoryD12A XRD1-9843
dc.description.sponsorshipIdLNLS-Brazilian Synchrotron Light LaboratoryD04B-XAFS1-10693
dc.format.extent57-63
dc.identifierhttp://dx.doi.org/10.1016/j.jssc.2013.06.025
dc.identifier.citationJournal Of Solid State Chemistry. San Diego: Academic Press Inc Elsevier Science, v. 205, p. 57-63, 2013.
dc.identifier.doi10.1016/j.jssc.2013.06.025
dc.identifier.issn0022-4596
dc.identifier.urihttp://hdl.handle.net/11449/111761
dc.identifier.wosWOS:000323858200010
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofJournal of Solid State Chemistry
dc.relation.ispartofjcr2.179
dc.relation.ispartofsjr0,632
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectCation distributionen
dc.subjectHigh-resolution X-ray fluorescenceen
dc.subjectElectron paramagnetic resonanceen
dc.subjectX-ray absorption spectroscopyen
dc.titleMagnetocrystalline interactions and oxidation state determination of Mn(2-x)V(1+x)O4 (x=0, 1/3 and 1) magnetorresistive spinel familyen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
unesp.author.lattes2835864951583089[5]
unesp.author.orcid0000-0003-3122-0121[2]
unesp.author.orcid0000-0001-7396-5741[1]
unesp.author.orcid0000-0001-8524-0959[5]
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Geociências e Ciências Exatas, Rio Claropt

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