Abstract
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.
| Item Type: | Journal article |
|---|---|
| Faculties: | Geosciences > Department of Earth and Environmental Sciences > Crystallography and Materials Science |
| Subjects: | 500 Science > 550 Earth sciences and geology |
| Language: | English |
| Item ID: | 18681 |
| Date Deposited: | 10. Mar 2014 14:12 |
| Last Modified: | 29. Apr 2016 09:15 |
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