Add time:07/26/2019         Source:sciencedirect.com

We present XAFS (K-edge) studies of the local atomic structure around the Nb and Te ions in niobium tellurides (NbTe2, Nb3Te4 and NbTe4) in comparison with ZrTe2. 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 NbTe4 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 TeTe bonds, for instance: the dimer (TeTe: 2.9 Å) and the squares (TeTe: 3.3 Å) in NbTe4, the interlayer and intralayer (TeTe: 2.9–4.0 Å) in NbTe2, through their Debye-Waller characteristics. In addition, a comparative analysis of Debye-Waller factors obtained in the different coordination shells (TeTe, TeNb, NbTe and NbNb) shows an evidence of correlation in the vibrational motion.

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