Oxidation driven decomposition of CeNbO4 in pure oxygen
Journal article, Peer reviewed
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Original versionChemistry of Materials 2008, 20(16):5434-5437 10.1021/cm801178a
CeNbO4 possess oxygen hyper-stoichiometry at ambient and moderate temperature. At elevated temperature CeNbO4+δ is thermally reduced to near stoichiometric CeNbO4 accompanied by a structural phase transition. Above the phase transition temperature re-oxidation of the material occurred in pure oxygen atmosphere, and in-situ X-ray diffraction revealed that CeNbO4 decomposed to CeO2 and CeNb3O9. Upon further heating CeNbO4 reappeared by a solid state reaction between CeO2 and CeNb3O9. The present findings demonstrate that CeNbO4+δ is metastable with respect to CeO2 and CeNb3O9 at low temperature.