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RESEARCH PRODUCT
XAFS studies of local atomic structure of niobium tellurides
Juris PuransJuris PuransHerve SassoliYves Matheysubject
ChemistryMechanical EngineeringDimerMetals and AlloysNiobiumchemistry.chemical_elementX-ray absorption fine structureIonMetalchemistry.chemical_compoundCrystallographyMechanics of Materialsvisual_artMaterials Chemistryvisual_art.visual_art_mediumdescription
Abstract We present XAFS (K-edge) studies of the local atomic structure around the Nb and Te ions in niobium tellurides (NbTe 2 , Nb 3 Te 4 and NbTe 4 ) in comparison with ZrTe 2 . Using a multi-shell best-fit analysis procedure, we have reconstructed local environments of the Nb and Te ions and compared them with the existing structural models. We found that at the Nb K-edge the XAFS data of NbTe 4 are extremely sensitive to metal clustering and to the subsequent departure from the average crystallographic positions. Moreover, at the Te K-edge the XAFS data allowed us to distinguished the different type of TeTe bonds, for instance: the dimer (TeTe: 2.9 A) and the squares (TeTe: 3.3 A) in NbTe 4 , the interlayer and intralayer (TeTe: 2.9–4.0 A) in NbTe 2 , through their Debye-Waller characteristics. In addition, a comparative analysis of Debye-Waller factors obtained in the different coordination shells (TeTe, TeNb, NbTe and NbNb) shows an evidence of correlation in the vibrational motion.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1997-11-01 | Journal of Alloys and Compounds |