Selected Elastic Moduli of Single-Crystal Olivines from Ultrasonic Experiments to Mantle Pressures

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Abstract
Ultrasonic interferometric measurements, developed for polycrystalline samples in a multi-anvil apparatus, were extended to single-crystal samples of San Carlos olivine and forsterite. The elastic moduli, C 22 and C 55 of San Carlos olivine and C 55 of pure forsterite, were measured to about 13 gigapascals. These data on C 22 for San Carlos olivine and C 55 for forsterite are consistent with earlier measurements and extrapolations. The C 55 for San Carlos olivine increases linearly as a function of increasing pressure, unlike the earlier nonlinear behavior observed at high pressure with impulsive stimulated scattering techniques.