Elastic Moduli of Single-Crystal Spinel at 25°C and to 2 kbar

Abstract

The elastic properties of a synthetic single-crystal spinel with a composition of MgO·2.6Al2O3 have been determined at 25°C and up to 2 kbar by measuring propagational velocities of ultrasonic waves using the method of pulse superposition. The isotropic moduli and Poisson's ratio were computed from the single-crystal values using the Voigt-Reuss-Hill approximation. Values of the adiabatic elastic moduli at 1 bar and 2 kbar and at 25°C are c11c12c441 bar2985.71537.21575.8(kbar)2 kbar2995.51545.01577.5(kbar). The adiabatic bulk modulus was computed to be 2019.9 kbar, and the pressure derivative of the adiabatic bulk modulus was found to be 4.18.