Gigahertz ultrasonic interferometry at high P and T : new tools for obtaining a thermodynamic equation of state
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چکیده
A new method of generating shear waves with near-optical wavelength has been developed for gigahertz ultrasonic interferometry. The new acoustic technique features a P-to-S conversion upon reflection inside an MgO buffer rod, and is used first to determine the full set of ambient P–T elastic constants (ci j ) of magnesiowüstite—(Mg, Fe)O. In addition, P-wave travel times have been measured in olivine to 250 ◦C at ∼2.5 GPa in a resistance-heated ultrasonic diamond anvil cell, demonstrating that acoustic coupling can be maintained at high temperature in a hydrostatic (alcohol) pressure medium. The new methodology brings us closer to obtaining a complete travel-time equation of state for single-crystal samples.
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تاریخ انتشار 2002