Structures of MO-TeO2 (M=Zn and Ba) glasses have been investigated by x-ray diffraction analysis. Local environments around Zn and Ba atoms were examined in terms of the difference RDF curve, ΔRDF, which was obtained by subtracting the RDF curve of ZnO-TeO2 glass from that of BaO-TeO2 glass at the same composition. Coordination numbers of Zn and Ba were estimated by the pair function curve fitting with the ΔRDF curves. The coordination number of Zn atoms (NZn-O) decreased from 5·3 to 3·9 as ZnO content increased from 10 to 40 mol%. Coordination numbers of Ba atoms (NBa-O) up to 35 mol% BaO were 6·1-6·4 independent of BaO content. NBa-O decreased over 35 mol% BaO and was 5·6 at 40 mol% BaO. On the basis of the local structures around Zn and Ba atoms revealed in this work and the one around Te atoms derived from the previous 125Te static NMR study, the detailed structure models of MO-TeO2 (M=Zn and Ba) glasses were proposed.
|Number of pages||6|
|Journal||Physics and Chemistry of Glasses|
|Publication status||Published - Dec 1 2000|
ASJC Scopus subject areas
- Ceramics and Composites
- Physical and Theoretical Chemistry