Temperature Dependence of Elastic, Dielectric, and Piezoelectric Constants in TeO2 Single Crystals

TLDR: In this article, the elastic stiffness constants except c13 have been found to decrease almost linearly with temperature between −120° and 120°C, and the effective elastic constant (c11-c12)/2, which corresponds to the exceptionally slow shear wave propagating along [110], increases with temperature.

Abstract: All of the elastic stiffness constants except c13 have been found to decrease almost linearly with temperature between −120° and 120°C. The constant c13 reaches the maximum in the vicinity of 0°C, above which it also decreases with temperature. On the other hand, the effective elastic constant (c11–c12)/2, which corresponds to the exceptionally slow shear wave propagating along [110], increases with temperature. The shear wave propagating in the (001) plane making angle of 35.9° with the X axis has zero temperature coefficient of velocity. Acoustic absorptions for several sound modes vary within 1 dB/cm for both the longitudinal wave (measured at 36 MHz) and shear wave (48 MHz) in the measured temperature range. Both real and imaginary parts of the dielectric constants increase monotonically with temperature, while the piezoelectric constant d14 decreases in the temperature range between −150° and 180°C.