Gigahertz ultrasonic interferometry at high P and T: New tools for obtaining a thermodynamic equation of state

S. D. Jacobsen*, H. A. Spetzler, H. J. Reichmann, J. R. Smyth, S. J. Mackwell, R. J. Angel, W. A. Bassett

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

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 (cij) 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.

Original languageEnglish (US)
Pages (from-to)11525-11530
Number of pages6
JournalJournal of Physics Condensed Matter
Volume14
Issue number44 SPEC ISS.
DOIs
StatePublished - Nov 11 2002

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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