High-temperature elasticity of polycrystalline orthoenstatite (MgSiO 3)
Compressional and shear wave velocities of a polycrystalline specimen of MgSiO3 orthoenstatite have been measured by ultrasonic interferometry to 1373 K at 300 MPa in an internally heated gas-medium apparatus. The elastic wave velocities and bulk and shear moduli vary linearly with temperature to 1073 K. Below 1073 K, the temperature derivatives of the elastic moduli [(∂KS/∂T)P = -28.3(7) MPa/K and (∂G/∂T)p = -14.5(1) MPa/K, respectively] determined in this study are consistent with averages of...[Show more]
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