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Structure and reactivity with oxygen of Pr2NiO4+δ: an in situ synchrotron X-ray powder diffraction study

hal.structure.identifierInstitut des Sciences Chimiques de Rennes [ISCR]
dc.contributor.authorBROUX, Thibault
hal.structure.identifierInstitut des Sciences Chimiques de Rennes [ISCR]
dc.contributor.authorPRESTIPINO, Carmelo
hal.structure.identifierInstitut des Sciences Chimiques de Rennes [ISCR]
dc.contributor.authorBAHOUT, Mona
hal.structure.identifierInstitut des Sciences Chimiques de Rennes [ISCR]
dc.contributor.authorPAOFAI, Serge
hal.structure.identifierSynchrotron SOLEIL [SSOLEIL]
dc.contributor.authorELKAIM, Erik
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorVIBHU, Vaibhav
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorGRENIER, Jean-Claude
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorROUGIER, Aline
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorBASSAT, Jean-Marc.
hal.structure.identifierInstitut des Sciences Chimiques de Rennes [ISCR]
dc.contributor.authorHERNANDEZ, Olivier
dc.date.issued2016-01
dc.identifier.issn1477-9226
dc.description.abstractEnThe promising SOFC cathode material Pr2NiO4.22 has been studied in situ under a pure oxygen atmosphere from 25 to 950 °C by high resolution synchrotron X-ray powder diffraction. At room temperature (RT) δ = 0.22(1), the average crystal structure turns out to be monoclinic. The subtle monoclinic distortion (γ = 90.066(1)° at RT), retained up to 460 °C, is interpreted in terms of specific tilt schemes of the NiO6 octahedra. It is also shown that Pr2NiO4.22 is incommensurately structurally modulated already at room temperature, in the same manner as the homologous cobaltate La2CoO4.14. The phase transition to the High Temperature Tetragonal (HTT) phase was completed at 480 °C without any evidence for the Low Temperature Orthorhombic (LTO) phase allowing clarifying the phase diagram of this K2NiF4-type ternary oxide. Moreover, it turns out that above 800 °C, the HTT phase transforms reversibly into two coexisting isomorphous tetragonal phases. The incommensurate modulation subsists up to 950 °C, although modified concomitantly with the two abovementioned phase transformations. In addition, the role of kinetics on the decomposition process is highlighted through thermo-gravimetric analyses
dc.language.isoen
dc.publisherRoyal Society of Chemistry
dc.title.enStructure and reactivity with oxygen of Pr2NiO4+δ: an in situ synchrotron X-ray powder diffraction study
dc.typeArticle de revue
dc.identifier.doi10.1039/c5dt03482e
dc.subject.halChimie
bordeaux.journalDalton Transactions
bordeaux.page3024-3033
bordeaux.volume45
bordeaux.issue7
bordeaux.peerReviewedoui
hal.identifierhal-01259407
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01259407v1
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