Structural Details of Sialons — Their Influence on Phase Stability

  • Jörgen Sjöberg
  • Robert Pompe


In view of the importance for phase relationships, preparation and properties, details of the structures of O’-sialons and β’-sialons have been studied. In addition to conventional powder x-ray diffraction, more recently developed techniques have been used: Neutron powder diffraction for determination of site occupancies; MAS NMR and EXAFS to study local atomic arrangements. The results are compared to literature data from related work. It is proposed that there exists a certain degree of local ordering in O’- and β’-sialon structures, and that this sets limits on the ranges of solid solubility for the two phases. This may also affect the strength of sialon grains in the matrix.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    Jack, K.H., Silicon Nitride, Sialons and Related Ceramics. Ceramics and Civilisation, 1987, Vol III, 259–88.Google Scholar
  2. 2.
    Ekström, T., Käll, P.-O., Nygren, M. & Olsson, P.-O., Dense Single-Phase β-sialon Ceramics by Glass-Encapsulated Hot Isostatic Pressing. J.Mater.Sci., 1989, 24, 1853–61.CrossRefGoogle Scholar
  3. 3.
    van Dijen, F.K., Metselaar, R. & Helmholdt, R.B., Neutron Diffraction of β’-sialon. J.Mater.Sci.Lett., 1987, 6, 1101–2.CrossRefGoogle Scholar
  4. 4.
    Dupree, R., Lewis, M.H. & Smith, M.E., Structural Characterization of Ceramic Phases with High Resolution 27Al NMR. J. Appl.Cryst., 1988, 21, 109–16.CrossRefGoogle Scholar
  5. 5.
    Harris, R.K., Leach, M.J. & Thompson, D.P., Synthesis & MAS NMR of 15N-Enriched Silicon Nitride. Chem.Mater., 2, 320–23.Google Scholar
  6. 6.
    Lindqvist, O., Sjöberg, J., Hull, S. & Pompe, R., Structural Changes in O’-sialons, Si2-xAlxN2-xO1+x, 0.04≤x≤0.40. Acta Cryst. B, 1991, in press.Google Scholar
  7. 7.
    Sjöberg, J., Harris, R.K. & Apperley, D., A 29Si,27Al and 15N MAS NMR Study of O’-sialons and Some Related Phases. J.Mater.Chem., 1991, submitted for publication.Google Scholar
  8. 8.
    Sjöberg, J., Ericsson, T. & Lindqvist, O.,. The Local Structure of β’-sialons — an EXAFS Study. J.Mater.Sci., 1991, in preparation.Google Scholar
  9. 9.
    Trigg, M.B. & Jack, K.H., Solubility of Aluminium in Silicon Oxynitride. J.Mater.Sci.Lett., 1987, 6, 407–8.CrossRefGoogle Scholar
  10. 10.
    Sjöberg, J., O’Meara, C. & Pompe, R. J.Eur.Ceram.Soc., 1991, in preparation.Google Scholar
  11. 11.
    Smith, J.V. & Bailey, S.W. Acta Cryst., 1963, 16, 801–811.CrossRefGoogle Scholar
  12. 12.
    Loewenstein, W., The distribution of aluminium in the tetrahedra of silicates and aluminates. Am.Miner., 1954, 39, 92–96.Google Scholar

Copyright information

© Elsevier Science Publishers Ltd and MPA Stuttgart 1992

Authors and Affiliations

  • Jörgen Sjöberg
    • 1
  • Robert Pompe
    • 1
  1. 1.Department of Inorganic ChemistryChalmers University of Technology and University of Göteborg, and Swedish Ceramic InstituteGöteborgSweden

Personalised recommendations