Properties and Structures of Tin Borophosphate Glasses

Abstract

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%.

Department(s)

Materials Science and Engineering

Sponsor(s)

Government of the Republic of China

Keywords and Phrases

Tin Phosphate Glass; Raman spectra; Refractive index

International Standard Serial Number (ISSN)

0022-3093; 1873-4812

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2010 Elsevier, All rights reserved.

Publication Date

01 Jun 2010

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