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RESEARCH PRODUCT
In situ XAFS study of phase transitions and hydrogen intercalation in WO3-MoO3 system
H. DexpertJuris PuransAlexei KuzminPh. Parentsubject
Phase transitionMaterials scienceValence (chemistry)HydrogenIntercalation (chemistry)chemistry.chemical_elementMolybdateCondensed Matter PhysicsElectronic Optical and Magnetic MaterialsX-ray absorption fine structureDelocalized electronCrystallographychemistry.chemical_compoundchemistryElectrical and Electronic EngineeringStoichiometrydescription
Abstract The WO 3 -MoO 3 system has several reconstructive and displacive phase transitions which can be induced by temperature and/or by change of stoichiometry or valence state of metal ions under hydrogen intercalation. We have studied in situ the local electronic and structural changes arising in WO 3 -MoO 3 system with hydrogen intercalation and temperature. In situ XAFS measurements at the Mo K and W L 3 edges in H y Mo x W 1− x O 3 compounds, performed at different hydrogen intercalation level and temperatures (from RT to 500°C), allowed us to determine the rearrangement in the first and second coordination shells of Mo and W cations during phase transitions. It was found that hydrogen insertion leads, depending on W/Mo ratio, to the appearance of localized (mixed valence) or delocalized electronic states with different Mo and W surrounding.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1995-03-01 | Physica B: Condensed Matter |