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Thermochemistry of Si6–zAlzOzN8–z(z = 0 to 3.6) materials

Published online by Cambridge University Press:  31 January 2011

Jian-Jie Liang ,
Alexandra Navrotsky ,
Valerie J. Leppert ,
Michael J. Paskowitz ,
Subhash H. Risbud ,
Thomas Ludwig ,
Hans J. Seifert ,
Fritz Aldinger  and
Mamoru Mitomo
Jian-Jie Liang
Affiliation:
Department of Chemical Engineering and Materials Science, University of California, Davis, California 95616
Alexandra Navrotsky
Affiliation:
Department of Chemical Engineering and Materials Science, University of California, Davis, California 95616
Valerie J. Leppert
Affiliation:
Department of Chemical Engineering and Materials Science, University of California, Davis, California 95616
Michael J. Paskowitz
Affiliation:
Department of Chemical Engineering and Materials Science, University of California, Davis, California 95616
Subhash H. Risbud
Affiliation:
Department of Chemical Engineering and Materials Science, University of California, Davis, California 95616
Thomas Ludwig
Affiliation:
Max-Planck-Institut für Metallforschung, Abteilung Aldinger/Pulvermetallurgisches Laboratorium, Heisenbergstrasse 5, D-70569 Stuttgart, Germany
Hans J. Seifert
Affiliation:
Max-Planck-Institut für Metallforschung, Abteilung Aldinger/Pulvermetallurgisches Laboratorium, Heisenbergstrasse 5, D-70569 Stuttgart, Germany
Fritz Aldinger
Affiliation:
Max-Planck-Institut für Metallforschung, Abteilung Aldinger/Pulvermetallurgisches Laboratorium, Heisenbergstrasse 5, D-70569 Stuttgart, Germany
Mamoru Mitomo
Affiliation:
National Institute of Research in Inorganic Materials, 1–1 Namiki, Tsukuba, Ibaraki 305, Japan
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Abstract

Enthalpies of formation were determined for β-sialon phases (Si6–zAlzOzN8–z, z = 0.46 to 3.6) by high-temperature oxidative drop solution calorimetry using an alkali-metal borate (52 wt% LiBo2; 48 wt% NaBO2) solvent. Oxygen gas was bubbled through the melt to accelerate oxidation of the oxynitride samples during dissolution. Sialons near z = 2 appear less stable energetically than ones with higher or lower nitrogen content. A large configurational entropy contribution for sialons with z > 2 may further stabilize these materials. This larger free energy driving form may be the reason for success in pulse-activated processing of these materials. The enthalpies of formation further suggest that a greater driving form for oxynitride formation exists in batch synthesis using SiO2 rather than Al2O3.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 12 , December 1999 , pp. 4630 - 4636
Copyright
Copyright © Materials Research Society 1999

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