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LiPON and NaPON glasses: A study of the ammonolysis of lithium and sodium metaphosphate melts
Author(s) -
De Souza José Ezequiel,
Rojas De Souza Seila,
Gebhardt Ryan,
Kmiec Steven,
Whale Alison,
Warthen Martin Steve
Publication year - 2020
Publication title -
international journal of applied glass science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.383
H-Index - 34
eISSN - 2041-1294
pISSN - 2041-1286
DOI - 10.1111/ijag.13508
Subject(s) - metaphosphate , raman spectroscopy , materials science , differential scanning calorimetry , analytical chemistry (journal) , glass transition , base (topology) , lithium (medication) , mineralogy , ionic bonding , nitrogen , inorganic chemistry , nuclear chemistry , ion , chemistry , phosphate , organic chemistry , composite material , medicine , mathematical analysis , physics , mathematics , optics , thermodynamics , endocrinology , polymer
Abstract Metaphosphate glasses such as LiPO 3 and NaPO 3 are known to incorporate nitrogen in the molten state under NH 3 flow to form (Li/Na)PON glasses through the reaction: (Li/Na)PO 3 + x NH 3 → (Li/Na)PO 3−(3 x /2) N x + (3 x /2)H 2 O, by partially replacing two‐coordinated oxygen with two‐ and three‐coordinated nitrogen. After nitridation, the glasses exhibit improved properties such as increased working range, chemical durability, and ionic conductivity. In this study, LiPO 3 and NaPO 3 glasses were prepared by the conventional melting and casting method and used as base glasses for the ammonolysis procedure. The nitridation processes were carried out by remelting the base glasses at temperatures up to 780°C, under a constant NH 3 flow. The effects on the nitrogen content in the resulting (Li/Na)PON glasses caused by different processing times and masses of powder and/or bulk materials were investigated. Nitridation was successfully confirmed by CNHS chemical analyses, Raman spectroscopy, and Differential Scanning Calorimetry. Mass loss measurements after the ammonolysis process and Raman spectroscopy were used to quantify the nitrogen content into the glass structure. A new approach using a specific Raman normalization, (P–N<)/(O–P–O) sym , has been demonstrated as a reliable, simple, and fast way to determine the amounts of N incorporated to metaphosphate glass structures.