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Oxidation driven decomposition of CeNbO4 in pure oxygen

Vullum, Fride; Grande, Tor
Journal article, Peer reviewed
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URI
http://hdl.handle.net/11250/2389403
Date
2008
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  • Institutt for materialteknologi [2747]
  • Publikasjoner fra CRIStin - NTNU [41881]
Original version
Chemistry of Materials 2008, 20(16):5434-5437   10.1021/cm801178a
Abstract
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.
Publisher
American Chemical Society
Journal
Chemistry of Materials

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