Chapter 39. Crystallization of Lanthanum Hexaluminate from MOCVD Precursors

  1. Don Bray
  1. P. D. Jero1,
  2. F. Rebillat2,
  3. D. J. Kent3 and
  4. J. G. Jones4

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294482.ch39

22nd Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 19, Issue 3

22nd Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 19, Issue 3

How to Cite

Jero, P. D., Rebillat, F., Kent, D. J. and Jones, J. G. (1988) Crystallization of Lanthanum Hexaluminate from MOCVD Precursors, in 22nd Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 19, Issue 3 (ed D. Bray), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294482.ch39

Author Information

  1. 1

    Air Force Research Laboratory, Wright-Patterson AFB, OH

  2. 2

    Laboratoire Des Composites Thermostructuraux, Pessac, France

  3. 3

    Air Force Research Laboratory, Wright-Patterson AFB, OH

  4. 4

    TMC Inc., Dayton, OH

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1988

ISBN Information

Print ISBN: 9780470375587

Online ISBN: 9780470294482

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Keywords:

  • aluminates;
  • magnetoplumbite;
  • synthesis;
  • atmospheric;
  • lanthanum

Summary

Lanthanum hexaluminate, LaAl11O18, belongs to the β-alumina/magnetoplumbite family of aluminates that has been identified as possible fiber coatings for ceramic matrix composites.1 Synthesis of LaAl11O18 by solid state reaction of La2O3 and Al2O3 (which first form LaAlO3, then further react to the hexaluminate) is reported to occur at very low rates. The rate limiting step in the reaction is reported to be the conversion of atmospheric O2 to 2O2- at the LaAl11O18 phase boundary in association with diffusion of La3+, such that formation of LaAl11O18 should depend on the O2 partial pressure in the atmosphere during the reaction.2, 3