Properties and Structure of Cesium Phosphate Glasses
A series of Cs-phosphate glasses, xCs2O(1−x)P2O5, where 0x0.60, were prepared. The glass transition temperature (Tg) decreases with the initial addition of Cs2O to P2O5, from 637 K at x=0 to 472 K at x=0.16. There is little change in Tg with further additions of Cs2O up to x=0.60. The 31P magic angle spinning nuclear magnetic resonance (MAS NMR) spectra show that Cs2O additions systematically convert the cross-linked ultraphosphate network of ν-P2O5 to a chain-like metaphosphate structure as x approaches 0.50. The 133Cs MAS NMR spectra show a 90 ppm increase in isotropic chemical shift (δiso) with increasing Cs2O content, which indicates a decrease in the average electron density around the Cs+ ions, more covalent Cs-O bonding, and a shorter average Cs-O bond length. The physical properties and spectroscopic results are interpreted using a structural model that considers the effects of composition on the average coordination environment of Cs+ ions.
C. A. Click et al., "Properties and Structure of Cesium Phosphate Glasses," Journal of Non-Crystalline Solids, Elsevier, Dec 2002.
The definitive version is available at http://dx.doi.org/10.1016/S0022-3093(02)01417-5
Materials Science and Engineering
Lockheed Martin Corporation
United States. Department of Energy
Keywords and Phrases
D190; N220; P150
Article - Journal
© 2002 Elsevier, All rights reserved.