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| - Oxidation Driven Decomposition of CeNbO4 in Pure Oxygen
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| Abstract
| - CeNbO4 possesses 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 reoxidation of the material occurred in a 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.
- The tetragonal polymorph of t-CeNbO4+δ transforms to the monoclinic polymorph m-CeNbO4+δ during cooling. CeNbO4+δ is metastable with respect to oxidation to CeO2 and CeNb3O9 at low temperatures and high partial pressures of oxygen.
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| Alternative Title
| - Oxidation Driven Decomposition of CeNbO4
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