Chapter 123. Spinel-SiAlONs — A New Group of Silicon-Based Hard Materials

  1. Prof. Dr. Norbert Auner4 and
  2. Prof. Dr. Johann Weis5
  1. Marcus Schwarz1,
  2. Rama S. Komaragiri1,
  3. Andreas Zerr1,
  4. Edwin Kroke1,
  5. Ralf Riedel1,
  6. Gerhard Miehe2 and
  7. James E. Lowther3

Published Online: 5 MAY 2008

DOI: 10.1002/9783527619924.ch123

Organosilicon Chemistry V: From Molecules to Materials

Organosilicon Chemistry V: From Molecules to Materials

How to Cite

Schwarz, M., Komaragiri, R. S., Zerr, A., Kroke, E., Riedel, R., Miehe, G. and Lowther, J. E. (2003) Spinel-SiAlONs — A New Group of Silicon-Based Hard Materials, in Organosilicon Chemistry V: From Molecules to Materials (eds N. Auner and J. Weis), Wiley-VCH Verlag GmbH, Weinheim, Germany. doi: 10.1002/9783527619924.ch123

Editor Information

  1. 4

    Department of Inorganic Chemistry, University of Frankfurt, Marie-Curie-Straße 11, 60439 Frankfurt am Main, Germany

  2. 5

    Consortium of Electrochemical Industry GmbH, Zielstattstraße 20, 81379 Munich, Germany

Author Information

  1. 1

    Fachgebiet Disperse Feststoffe, Fachbereich Material- und Geowissenschaften Technische Universität Darmstadt Petersenstraße 23, D-64287 Darmstadt, Germany Tel.:+49 6151 16 6347—Fax:+49 6151 16 6346

  2. 2

    Fachgebiet Strukturforschung Technische Universität Darmstadt Petersenstraße 23, D-64287 Darmstadt, Germany

  3. 3

    School of Physics, University of the Witwatersrand P. O. Wits. Johannesburg, South Africa.

Publication History

  1. Published Online: 5 MAY 2008
  2. Published Print: 26 SEP 2003

ISBN Information

Print ISBN: 9783527306701

Online ISBN: 9783527619924

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Keywords:

  • ceramics;
  • high-pressure chemistry;
  • oxide-nitrides;
  • sialons;
  • spinel phases

Summary

The synthesis of multinary oxide-nitride spinels, γ-Si2AlON3, γ-Si1.9Al1.1O1.1N2.9, γ-SiAl2O2N2 and γ-Si0.9Al2.1O2.1N1.9, is presented. These phases belong to a solid solution series γ-Si3-xAlxOxN4-x between the new high-pressure modification of silicon nitride (γ-Si3N4) and a hypothetical γ-Al3O3N. The spinel-sialons were characterized using optical and scanning electron microscopy, electron probe microanalysis, X-ray powder diffractometry and micro-Raman spectroscopy. The spinel structure was also investigated using techniques of ab-initio electronic structure theory, revealing a bulk modulus B0 of about 270 GPa. The Vickers microhardness of γ-Si2AlON3 was measured to be 27 GPa and a mean fracture toughness of 4.6 Mpa m1/2 was obtained from the post-indentation crack length (ICL) method. These excellent mechanical properties make γ-sialons a promising new class of hard ceramic materials.