Structure and ``oxidation behavior'' of W24O70, a new member of the {103} CS series of tungsten oxides
Abstract
Reduced tungsten trioxide crystals WO 3- x, formed by vapor transport from a preparation with bulk composition WO -2.90, have been studied by X-ray diffraction and electron microscopy. A single-crystal X-ray investigation showed the existence of the ordered {103} CS-structure W 24O 70, a new member of the homologous series W nO 3 n-2 . Electron diffraction patterns of crystal fragments, with a few exceptions, showed the presence of the W 24O 70 phase (composition WO 2.917). Lattice images, however, indicated a fairly ordered {103} CS-phase, W 24O 70, intergrown with slabs of WO 3 giving gross compositions of the examined crystals in the range WO 2.93WO 2.96. The wide WO 3 slabs were probably formed by an oxidation process during the preparation.
- Publication:
-
Journal of Solid State Chemistry France
- Pub Date:
- November 1980
- DOI:
- 10.1016/0022-4596(80)90472-7
- Bibcode:
- 1980JSSCh..35..120S