Structure, Thermal Behavior, Chemical Durability, and Optical Properties of the Na2O–Al2O3–TiO2–Nb2O5–P2O5 Glass System

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The FTIR, Raman, UV-Vis, 31P MAS-NMR, DTA, and refractive index measurements have been combined to investigate a series of glasses with the general formula 20Na2O–5Al2O3xTiO2–(45−x)Nb2O5–30P2O5, 15≤x≤45. The glass structure, as well as thermal, optical, and chemical durability properties, were then described as functions of the fNb/fTi ratio. An increase of the fNb/fTi ratio correlates with a decrease in length of the average phosphate chains linked through Nb–O–P and Ti–O–P bonds, with an increase in the glass stability and with increase in the linear refractive indices at 632.8 nm from 1.79 to 1.89. Furthermore, niobium is more effective than titanium in improving chemical durability.

Document Type: Research Article


Affiliations: Laboratório de Química do Estado Sólido, Instituto de Química, Universidade Estadual de Campinas-UNICAMP, Campinas, SP, Brazil

Publication date: January 1, 2007

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