Elastic Moduli of Single-Crystal Zinc Oxide

Abstract

New interest in zinc oxide has developed since it has been discovered to be piezoelectric. In line with thisinterest the zero field adiabatic elastic moduli have been measured. A high frequency, 60 to 500 Mc ultrasonicpulse technique was employed. Two crystals with sufficiently high conductivity to effectively shortthe electric field were available for the measurements. A density of 5.676 g/cm 3 was used to calculate the zero-field adiabatic elastic moduli. This density wastaken as exact with reference to the error limits. The moduli in units of 10 12 dyn/cm 2 at 25°C are: c 11 E = 2.097 ±0.1% , c 12 E = 1.211 ±0.15% , c 13 E = 1.051 ±0.15% , c 33 E = 2.109 ±0.1% , c 44 E = 0.4247 ±0.1% , c 66 E = 1 2 (c 11 E −c 12 E ) = 0.4429±0.1% .