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±0.6GPa, C44 = 74.6±0.7GPa, and C12 = 112.4±1.1 GPa. The resulting bulk and (Voigt-Reuss-Hill) shear moduli are K = 149.5±1.0GPa and GVRH = 66.3±0.8GPa, 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 MPa/°C and dGVRH/dT= -8±2 MPa/°C. Elastic anisotropy was found to remain essentially constant over the temperature range studied.
ASJC Scopus subject areas
- Physics and Astronomy(all)