High temperature single crystal properties of mullite

W. M. Kriven, J. W. Palko, S. Sinogeikin, J. D. Bass, A. Sayir, G. Brunauer, H. Boysen, F. Frey, J. Schneider

Research output: Contribution to journalArticlepeer-review


Extensive neutron diffraction and Rietveld studies of dense, hot pressed mullite (3Al2O3·2SiO2) have been conducted up to 1650 °C in air, yielding a complete set of lattice parameters and axial thermal expansion coefficients. Unconstrained powders of the same stoichiometric composition were also analyzed by X-ray diffraction and Rietveld techniques up to 900 °C in air, from which lattice parameters and thermal expansion coefficients were obtained. An earlier reported structural discontinuity was confirmed by XRD to lie in the temperature range 425 to 450 °C. Single-crystalline mullite fibers of composition 2·5Al2O3·SiO2 were grown from the melt by a laser-heated, float zone method. A partial set of the single-crystal elastic moduli were determined from various sections of fiber, by Brillouin spectroscopy, from room temperature up to 1400 °C. They indicated a roughly 10% reduction in stiffness over that temperature range.

Original languageEnglish (US)
Pages (from-to)2529-2541
Number of pages13
JournalJournal of the European Ceramic Society
Issue number13-14
StatePublished - Oct 1999


  • Elastic modulus
  • Fibers
  • Mullite
  • Thermal expansion
  • X-ray methods

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry


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