"A series of cesium phosphate glasses, XCs2O·(1-X)P2O5, where X ≤ O.60 were prepared. The addition of ~ 16% mole Cs2O to P2O5 decreases the glass transition temperature (Tg ) by 156K. Tg increases by 25K with the further addition of cesium oxide up to 60 mole% CS2O. The density of V-P2O5 is 2.39 g/cm3, and with cesium oxide additions the cesium phosphate glass density increases monotonically to 3.88 g/cm3 (59.1 mole% Cs2O). The 31P magic angle spinning nuclear magnetic resonance (MAS NMR) spectra show that the addition of Cs2O causes a continuous conversion of the 3D ultraphosphate network to the chain metaphosphate structure. There is a break in the Q2 isotropic chemical shift (δiso) at ~35 mole% Cs2O. The 133Cs MAS NMR spectra show a 90 ppm increase in δiso, which indicates a decrease in the average electron density around the cesium, more covalent Cs-O bonding, and a shorter average Cs-O bond length. The Raman data indicates a conversion of the 3D phosphate glass network to a chain metaphosphate glass structure with the addition of Cs2O. The properties and spectroscopic results are interpreted using a structural model that considers the effects of composition on the average coordination environments of cesium ions"--Abstract, leaf 2.
Brow, Richard K.
Day, D. E.
Blum, Frank D.
Materials Science and Engineering
M.S. in Ceramic Engineering
University of Missouri--Rolla
ix, 102 pages
© 2000 Carol Ann Click, All rights reserved.
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Click, Carol A., "Properties and structures of cesium phosphate glasses" (2000). Masters Theses. 1909.
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