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Energetics of oxidation of RE–Si–Al–O–N glasses

Published online by Cambridge University Press:  29 June 2016

Yahong Zhang ,
Alexandra Navrotsky ,
Dirk Matusch  and
Hans Jürgen Seifert
Yahong Zhang
Affiliation:
Thermochemistry Facility and NEAT ORU, University of California at Davis, Davis, California 95616
Alexandra Navrotsky
Affiliation:
Thermochemistry Facility and NEAT ORU, University of California at Davis, Davis, California 95616
Dirk Matusch
Affiliation:
Max-Planck-Institut für Metallforschung, Stuttgart, Germany
Hans Jürgen Seifert
Affiliation:
Max-Planck-Institut für Metallforschung, Stuttgart, Germany
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Abstract

Enthalpies of drop solution in molten 52 wt.% LiBO2-48 wt.% NaBO2 at 1078 K were measured for RE1.1Si1.7Al0.6O6-1.5xNx (x = 0, 0.2, 0.4, 0.6, 0.8) glasses for RE = Nd, Gd, Dy, Er, and Y. Linear relations between enthalpies of formation from elements and nitrogen content indicate that, within the experimental composition range, sites occupied by nitrogen ions are approximately equivalent in energy for a given substitutional series. The energetics of different rare-earth SiAlON glasses appears to be dominated by differences in the acid/base character of the cations. The onset glass-transition temperature increases linearly with increasing nitrogen content for the same rare earth and with decreasing rare-earth ionic radius for the same nitrogen content.

Type
Research Article
Information
Journal of Materials Research , Volume 18 , Issue 7 , July 2003 , pp. 1607 - 1613
Copyright
Copyright © Materials Research Society 2003

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