Journal
JOURNAL OF NON-CRYSTALLINE SOLIDS
Volume 358, Issue 15, Pages 1795-1805Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jnoncrysol.2012.05.027
Keywords
Zinc niobium phosphate glass; Chemical durability; NMR spectroscopy; Raman spectroscopy
Funding
- National Sciences and Engineering Research Council of Canada
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In an effort to design low-melting, durable, transparent glasses, two series of glasses have been prepared in the NaPO3-ZnO-Nb2O5-Al2O3 system with ZnO/Nb2O5 ratio of 2 and 1. The addition of ZnO and Nb2O5 to the sodium aluminophosphate matrix yields a linear increase of properties such as glass transition temperature, density, refractive index and elastic moduli. The chemical durability is also significantly, but nonlinearly, improved. The glass with the highest niobium concentration, 55NaPO(3)-20ZnO-20Nb(2)O(5)-5Al(2)O(3) was found to have a dissolution rate of 4.5 x 10(-8) g cm(-2) min(-1), comparable to window glass. Structural models of the glasses were developed using Raman spectroscopy and nuclear magnetic resonance spectroscopy, and the models were correlated with the compositional dependence of the properties. (C) 2012 Elsevier B.V. All rights reserved.
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