Oxidation Driven Decomposition of CeNbO4 in Pure Oxygen | Zendy

Fride VullumBruer | Zendy; Tor Grande | Zendy

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Oxidation Driven Decomposition of CeNbO₄ in Pure Oxygen

Author(s) -

Fride VullumBruer,

Tor Grande

Publication year - 2008

Publication title -

chemistry of materials

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.741

H-Index - 375

eISSN - 1520-5002

pISSN - 0897-4756

DOI - 10.1021/cm801178a

Subject(s) - stoichiometry , oxygen , decomposition , metastability , materials science , phase transition , phase (matter) , diffraction , transition temperature , analytical chemistry (journal) , atmosphere (unit) , x ray crystallography , chemistry , crystallography , inorganic chemistry , thermodynamics , organic chemistry , condensed matter physics , physics , superconductivity , optics

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

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