An X-ray and Neutron Scattering Study of the Structure of Zinc Vanadate Glasses
The short-range order of vitreous V20 5 and of three (Zn0)Jt(V20 5)1_x glasses with x = 0.2, 0.4, and 0.5 is studied by X-ray and neutron diffraction experiments where the change of the contrast allows to resolve the V -0 and Z n -0 correlations. The V -0 and the Z n -0 first-neighbor peaks are appr...
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Veröffentlicht in: | Zeitschrift für Naturforschung. A, A journal of physical sciences A journal of physical sciences, 2001-07, Vol.56 (6), p.478-488 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | The short-range order of vitreous V20 5 and of three (Zn0)Jt(V20 5)1_x glasses with x = 0.2, 0.4, and 0.5 is studied by X-ray and neutron diffraction experiments where the change of the contrast allows to resolve the V -0 and Z n -0 correlations. The V -0 and the Z n -0 first-neighbor peaks are approximat ed by several Gaussian functions. In case of vitreous V20 5 two obvious V -0 distances exist which are related with V 0 4 and V 0 5 units. With ZnO additions the V -O coordination number decreases from 4.4 in vitreous V20 5 to 4.0 in the metavanadate glass where the strongest decrease of the fraction of V 0 5 units is found for glasses of * < 0.2. Dominantly, the V 0 5 groups are linked with the neighboring units by comers. The Z n-0 coordination numbers of the modified glasses are about five with closest dis tances of = 0.200 nm. |
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ISSN: | 0932-0784 1865-7109 |
DOI: | 10.1515/zna-2001-0609 |