Electron microscope study of revolving crystal growth of {beta}-type vanadium oxide hydrate under hydrothermal conditions
Conference
·
OSTI ID:51633
- Okayama Univ. of Science (Japan)
Anomalous revolving stacking crystal growth of {beta}-type vanadium oxide hydrate formed by hydrothermal treatment was studied by transmission electron microscopy. Recently, the authors identified two different types of vanadium oxide hydrates with unique structures in the a-b Planes. One is the well-known orthorhombic {alpha}-V{sub 2}0{sub 5}{center_dot}nH{sub 2}O which can be formed by the conventional polymerization of decavanadic acid Prepared with the ion exchange method. The structure of this {alpha}-type was analyzed to be a sheared structure of anhydrous V{sub 2}0{sub 5}. This material has a Promising future as a composite materials and intercalation compound. The second is {beta}-type, which was first formed by Oka et al. through hydrothermal hydrolysis of vanadyl sulfate. Recently the present authors produced this type of material through an a hydrothermal treatment of vanadium oxide gel under oxygen deficient conditions. The chemical analysis of this hydrate gave oxygen deficient compositions, V{sub 2}0{sub 5{minus}x},(x = 0.25{approximately}0.14). The structure was analyzed by Yao et al. to be monoclinic (a = 1.168 nm, b = 0.3656 nm and c = 1.451 nm, {beta} = 101.8{degree}). This appears to be orthorhombic when observed in electron diffraction normal to the film plane and is very similar to the pattern of the reciprocal lattice of the a-b plane of the anhydrous V{sub 2}0{sub 5}. Hydrothermal formation of the materials seems to be a promising method to prepare well defined samples. This present paper reports an electron diffraction study of the crystal growth of the {beta}-type vanadium oxide hydrate which has been prepared hydrothermally.
- OSTI ID:
- 51633
- Report Number(s):
- CONF-940411--; ISBN 1-55899-246-4
- Country of Publication:
- United States
- Language:
- English
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