Measurement of elastic constants and internal frictions on single-crystal mgo by rectangular parallelepiped resonance

Abstract

A measurement of complex elastic constants is made on two single crystal Mgo specimens using a resonance method. The results on the realpart of the elastic constants are consistent with those reported by CHANG and BARSCH (1969) and SPETZLER (1970) except for a small difference inC12. The elastic constants at a theoretical density of 3.584g/cm3 are [formula omitted] in Mbar at 293K. The small deviations of the elastic constants in different specimens from the above valucs are well related to the deviation of the actual density from the theoretical one. The internal frictions relating to respective elastic constants are [formula omitted], and [formula omitted] at room temperature and 1MHz. The dominant dissipation is not caused by the shear on a plane of easy glide {110}<110=, but the shear on {100}. © 1976, The Seismological Society of Japan, The Volcanological Society of Japan, The Geodetic Society of Japan. All rights reserved.