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

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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.

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Authors and Affiliations

  1. Department of Chemical Engineering and Materials Science, University of California, Davis, California, 95616, USA

    Jian-Jie Liang, Alexandra Navrotsky, Valerie J. Leppert, Michael J. Paskowitz & Subhash H. Risbud

  2. Max-Planck-Institut für Metallforschung, Abteilung Aldinger/Pulvermetallurgisches Laboratorium, Heisenbergstrasse 5, D-70569, Stuttgart, Germany

    Thomas Ludwig, Hans J. Seifert & Fritz Aldinger

  3. National Institute of Research in Inorganic Materials, 1-1 Namiki, Tsukuba, Ibaraki, 305, Japan

    Mamoru Mitomo

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  1. Jian-Jie Liang
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  2. Alexandra Navrotsky
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  3. Valerie J. Leppert
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  4. Michael J. Paskowitz
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  5. Subhash H. Risbud
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  9. Mamoru Mitomo
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Liang, JJ., Navrotsky, A., Leppert, V.J. et al. Thermochemistry of Si6–zAlzOzN8–z(z = 0 to 3.6) materials. Journal of Materials Research 14, 4630–4636 (1999). https://doi.org/10.1557/JMR.1999.0626

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  • DOI: https://doi.org/10.1557/JMR.1999.0626

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