Preparation of Phosphorus Oxynitride Glasses
Potter, B. G. and Zanotto, E. D. and Zwanziger, J. W.
The preparation of oxynitride glass by melting sodium metaphosphate in anhydrous ammonia is described. Glasses containing up to ≈ 12 wt% nitrogen were prepared with the nitrogen content depending upon the melting temperature, time, and ammonia flow rate through the furnace. Nitriding the NaPO3 starting glass decreased the dissolution rate in water and thermal expansion coefficient while increasing the dilatometric softening temperature, glass transition temperature, refractive index, and microhardness. Oxynitride glasses were considerably more difficult to crystallize than the starting NaPO3 glass. Models for nitrogen dissolution are used to calculate the glass composition from the measured weight loss and analyzed nitrogen content.
M. Rajaram et al., "Preparation of Phosphorus Oxynitride Glasses," Journal of Non-Crystalline Solids, Elsevier, Jan 1986.
The definitive version is available at http://dx.doi.org/10.1016/0022-3093(86)90090-6
Materials Science and Engineering
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