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Vanadium clustering/declustering in P2-Na1/2VO2 layered oxide

hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorGUIGNARD, Marie
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorCARLIER, Dany
hal.structure.identifierAdvanced Photon Source [ANL] [APS]
dc.contributor.authorSUCHOMEL, Matthew
hal.structure.identifierSynchrotron SOLEIL [SSOLEIL]
dc.contributor.authorELKAÏM, Erik
hal.structure.identifierMatériaux, Rayonnements, Structure [NEEL - MRS]
dc.contributor.authorBORDET, Pierre
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorDECOURT, Rodolphe
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorDARRIET, Jacques
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorDELMAS, Claude
dc.date.issued2014
dc.identifier.issn0897-4756
dc.description.abstractEnThe new layered phase P2-Na1/2VO2 has been synthesized by sodium electrochemical deintercalation. Its structure has been studied by high resolution powder diffraction, pair distribution function analysis, and nuclear magnetic resonance spectroscopy between 300 and 350 K. An increase of 2 orders of magnitude in its electronic conductivity has been observed at approximately 322 K, and a structural transition has been found to occur simultaneously. The arrangement of sodium ordering in P2-Na1/2VO2, which maximizes sodium-sodium distances to lower electrostatic repulsions between alkali ions, is found to be unchanged across this transition. At room temperature, high resolution powder diffraction and pair distribution function analysis reveal the triangular lattice formed by vanadium ions to be distorted by the formation of pseudotrimers clusters with vanadium-vanadium distances as short as 2.581 Å. Above the transition, the pseudotrimers disappear and the triangular vanadium lattice becomes more regular with a mean vanadium-vanadium distance of 2.88 Å. At 350 K, the increase in P2-Na1/2VO2 electronic conductivity is due to enhanced charge transport resulting from the declustering of vanadium ions. These results highlight how sodium ordering between the MO2 layers and the electronic transport within the MO2 layers are intimately correlated in NaxMO2-type sodium-layered oxides.
dc.language.isoen
dc.publisherAmerican Chemical Society
dc.subject.enLayered compounds
dc.subject.enSynthesis
dc.subject.enSodium
dc.subject.enElectrochemical deintercalation
dc.subject.enMaterials characterization
dc.title.enVanadium clustering/declustering in P2-Na1/2VO2 layered oxide
dc.typeArticle de revue
dc.identifier.doi10.1021/cm403114k
dc.subject.halChimie/Matériaux
bordeaux.journalChemistry of Materials
bordeaux.page1538-1548
bordeaux.volume26
bordeaux.issue4
bordeaux.peerReviewedoui
hal.identifierhal-00968941
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00968941v1
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