Properties and Structures of Tin Borophosphate Glasses
The effects of B2O3-additions on the properties and structures of two series of Sn(II)-borophosphate glasses were determined. The addition of up to 28 mol% B2O3 to a 66.7SnO-33.3P 2O5 base glass (series I), and the substitution of up to 13 mol% B2O3 for P2O5 in the same base glass (series II) increase Tg from 265 °C to 357 °C and 306 °C, respectively, while reducing the aqueous corrosion rates (at 40 °C) by an order of magnitude. The refractive index of the series I glasses decreases slightly, from 1.784 to 1.725, and increases for series II, to 1.834, at 632.8 nm. Raman spectroscopy reveals that borate additions to both series reduce the number of P-O-P linkages by converting pyrophosphate anions to orthophosphate anions. 11B NMR spectra indicate that tetrahedral borophosphate units, B(OP)4, are initially formed when B2O3 is added to the Sn-pyrophosphate base glass. More complex tetrahedral and trigonal borate sites form when B2O3 contents exceed about 10 mol%.
R. K. Brow et al., "Properties and Structures of Tin Borophosphate Glasses," Journal of Non-Crystalline Solids, vol. 356, no. 28 - 30, pp. 1379-1384, Elsevier, Jun 2010.
The definitive version is available at http://dx.doi.org/10.1016/j.jnoncrysol.2010.02.019
Materials Science and Engineering
Government of the Republic of China
Keywords and Phrases
Tin Phosphate Glass; Raman spectra; Refractive index
Article - Journal
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