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Energetics of Nitridophosphates PON and “LiNaPON Glasses”

Published online by Cambridge University Press:  16 February 2011

F. Tessier ,
A. Le Sauze ,
R. Marchand  and
A. Navrotsky
F. Tessier
Affiliation:
Thermochemistry Facility, Dept. of Chemical Engineering and Materials Science, University of California at Davis, Davis, CA 95616 UMR CNRS 6512 “Verres et Céramiques”, Université de Rennes 1, F-35042 Rennes cedex, France
A. Le Sauze
Affiliation:
UMR CNRS 6512 “Verres et Céramiques”, Université de Rennes 1, F-35042 Rennes cedex, France
R. Marchand
Affiliation:
UMR CNRS 6512 “Verres et Céramiques”, Université de Rennes 1, F-35042 Rennes cedex, France
A. Navrotsky
Affiliation:
Thermochemistry Facility, Dept. of Chemical Engineering and Materials Science, University of California at Davis, Davis, CA 95616
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Abstract

Structural analogies have been demonstrated between the β-cristobalite, α-quartz and moganite phases of PON and its isoelectronic analog SiO2. Whereas the energetics of silica are well established, no data exist for the energetics of formation of nitridophosphates. High temperature solution calorimetry was used to determine the energetics of PON samples and a series of “LiNaPON oxynitride” glasses. Enthalpies of formation were measured as -371.71 ± 4.45 kJ/mol and -356.14 ± 3.98 for β-cristobalite and amorphous PON respectively and as -961.88 ± 3.86 kJ/mol for a 9 wt% nitrogen containing LiNaPON glass. These values constitute the first set of energetics data necessary to achieve further thermodynamic studies on nitridophosphates.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 547: Symposium DD – Solid-State Chemistry of Inorganic Materials II , 1998 , 389
Copyright
Copyright © Materials Research Society 1999

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