Factors Influencing Nitrogen Dissolution in Phosphate Melts


Phosphate glasses containing up to 12 wt% nitrogen have been made by melting in anhydrous ammonia. A study of sodium metaphosphate (NaPO3) and (50-X) Na2O multiplied by (times) X BaO multiplied by (times) 50 P2O5 melts shows that nitrogen content increases with time and temperature of remelting. Increasing the water vapor content of the ammonia or adding alkaline earth oxide decreases nitrogen solubility in the melt. Nitrogen is present predominantly as the nitride (N3-) along with small quantities of the amide (-NH2) and imide (-NH-). With substitution of BaO, the Ba2+ plus ion occupies interstitial sites in the network which reduces the maximum amount of nitrogen that can dissolve in the melt.

Meeting Name

XIV International Congress on Glass (1986: New Delhi, India)


Materials Science and Engineering

Keywords and Phrases

Ammonia; Glass Manufacture - Melting; Nitrogen - Dissolution; Sodium Compounds; Anhydrous Ammonia; Glass Formation; Glass Melting; Phosphate Glass; Sodium Metaphosphate Glass; Water Vapor, Glass

Document Type

Article - Conference proceedings

Document Version


File Type





© 1986 Indian Ceramic Society, All rights reserved.

Publication Date

01 Jan 1986

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