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Elastic constants of yttria (Y2O3) monocrystals to high temperatures

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5 Author(s)
Palko, James W. ; Department of Materials Science and Engineering, University of Illinois, Urbana, Illinois 61801 ; Kriven, Waltraud M. ; Sinogeikin, Stanislav V. ; Bass, Jay D.
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The single-crystal elastic moduli of yttria have been measured by Brillouin spectroscopy up to 1200 °C. The room temperature values obtained are C11=223.7±0.6 GPa, C44=74.6±0.7 GPa, and C12=112.4±1.1 GPa. The resulting bulk and (Voigt–Reuss–Hill) shear moduli are K=149.5±1.0 GPa and GVRH=66.3±0.8 GPa, respectively. These agree much more closely with experimental values reported for polycrystalline samples than do previous single-crystal measurements. Linear least squares regressions to the variation of bulk and shear moduli with temperature result in derivatives of dK/dT=-17±2 MPaC and dGVRH/dT=-8±2 MPaC. Elastic anisotropy was found to remain essentially constant over the temperature range studied. © 2001 American Institute of Physics.

Published in:

Journal of Applied Physics  (Volume:89 ,  Issue: 12 )