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Nitrogen Dissolution in Sodium Alkaline‐Earth Metaphosphate Melts
Author(s) -
RAJARAM MOHAN,
DAY DELBERT E.
Publication year - 1987
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1987.tb04968.x
Subject(s) - dissolution , metaphosphate , anhydrous , alkaline earth metal , nitriding , thermal expansion , inorganic chemistry , ammonia , mineralogy , materials science , nitrogen , chemistry , analytical chemistry (journal) , alkali metal , metallurgy , environmental chemistry , phosphate , organic chemistry
Phosphorus oxynitride glasses were prepared by remelting (5O – X )Na 2 O · X BaO · 50P 2 O 5 , X = 0, 10, 20, 25, and 30, and 30Na 2 O · 20MO · 50P 2 O 5 , M = Mg, Ca, Sr, and Ba‘, glasses in anhydrous ammonia. The nitrogen content depends upon the temperature and time of remelting in ammonia and the concentration and size of the alkaline‐earth ion. Nitriding the starting glass decreased the dissolution rate in deionized water and thermal expansion coefficient and increased the dilatometric softening temperature and refractive index. The dissolution rate of the base glass in deionized water depended upon the concentration and size of the alkaline‐earth ion, but for nitrided glasses, it was essentially independent of the alkaline‐earth cation. The thermal expansion coefficient for all the oxynitride glasses decreased with increasing alkaline‐earth concentration and cation field strength.