Abstract
A new method of generating shear waves with near-optical wavelengthhas been developed for gigahertz ultrasonic interferometry. The newacoustic technique features a P-to-S conversion upon reflection inside anMgO buffer rod, and is used first to determine the full set of ambientP–T elastic constants(cij)of magnesiowüstite—(Mg, Fe)O. In addition, P-wave traveltimes have been measured in olivine to 250̂C at ∼ 2.5GPa in a resistance-heated ultrasonic diamond anvil cell, demonstrating thatacoustic coupling can be maintained at high temperature in a hydrostatic(alcohol) pressure medium. The new methodology brings us closer toobtaining a complete travel-time equation of state for single-crystal samples.
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