Factors Influencing Nitrogen Dissolution in Phosphate Melts

Author

Mohan Rajaram
D. E. Day, Missouri University of Science and TechnologyFollow

Abstract

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 (N^3-) 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.

Recommended Citation

M. Rajaram and D. E. Day, "Factors Influencing Nitrogen Dissolution in Phosphate Melts," XIV International Congress on Glass - Collected Papers (New Delhi, Ind), vol. 1, pp. 110 - 117, Indian Ceramic Society, Jan 1986.

Meeting Name

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

Department(s)

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

Citation

File Type

text

Language(s)

English

Rights

© 1986 Indian Ceramic Society, All rights reserved.

Publication Date

01 Jan 1986