Bibliographic Details
| Title: |
X-Ray Absorption Near Edge Structure and X-Ray Diffraction Studies of New Cubic CsVTeO5and CsVTeO6Compounds |
| Authors: |
Young-Sik Hong, Young-Sik Hong, Jacques Darriet, Jacques Darriet, Joo-Byoung Yoon, Joo-Byoung Yoon, Jin-Ho Choy, Jin-Ho Choy |
| Source: |
Japanese Journal of Applied Physics; March 1999, Vol. 38 Issue: 3 p1506-1506, 1p |
| Abstract: |
The compounds CsVTeO5and CsVTeO6have been synthesized by solid-state reactions in an oxygen flow. CsVTeO6was decomposed to CsVTeO5at 550°C, and this CsVTeO5was re-transformed into CsVTeO6under high oxygen pressure. The local structure around vanadium and its valence state have been studied by X-ray absorption near edge structure spectroscopy at the vanadium K-edge. CsVTeO6shows a weak peak at the pre-edge region, which indicates that the vanadium is stabilized in an octahedral site as expected in normal AB2O6pyrochlore. On the other hand, a strong pre-edge peak appeared in CsVTeO5as in CsVO3and V2O5, which confirms that the local symmetry around the vanadium atom is highly distorted without an inversion center. The Rietveld refinement shows that CsVTeO5has the cubic symmetry (space group Fd3m) with a= 10.4842(2) Å, which is similar to the high-temperature polymorphic CsTiAsO5phase with highly distorted octahedral symmetry around the titanium atom. |
| Database: |
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