Elastic Moduli of Single-Crystal Zinc Oxide

New interest in zinc oxide has developed since it has been discovered to be piezoelectric. In line with this interest the zero field adiabatic elastic moduli have been measured. A high frequency, 60 to 500 Mc ultrasonic pulse technique was employed. Two crystals with sufficiently high conductivity to effectively short the electric field were available for the measurements. A density of 5.676 g/cm3 was used to calculate the zero-field adiabatic elastic moduli. This density was taken as exact with reference to the error limits. The moduli in units of 1012 dyn/cm2 at 25°C are: c11E = 2.097 ±0.1%, c12E = 1.211 ±0.15%, c13E = 1.051 ±0.15%, c33E = 2.109 ±0.1%, c44E = 0.4247 ±0.1%, c66E = 12(c11E−c12E) = 0.4429±0.1%.