Brillouin scattering and X-ray diffraction of San Carlos olivine: direct pressure determination to 32 GPa

Chang Sheng Zha, Thomas S. Duffy, Robert T. Downs, Ho Kwang Mao, Russell J. Hemley

Research output: Contribution to journalArticle

119 Scopus citations


The single-crystal elastic moduli of San Carlos olivine, (Mg0.9Fe0.1)2SiO4, were determined at seven pressures between 2.5 and 32.5 GPa by Brillouin spectroscopy in a diamond anvil cell. The unit cell volume was also determined at each pressure (and ambient pressure) by single-crystal X-ray diffraction. The shear elastic moduli exhibit non-linear pressure dependencies. In particular, a non-linear dependence is required for the elastic modulus, C55, above 10 GPa. Aggregate bulk and shear moduli were determined from Hashin-Shtrikman averages of the individual constants. Pressures were determined by fitting the bulk modulus (Reuss bound) and volume data to a third-order Eulerian finite strain equation and integrating. The results are compared to independent pressure measurements made using the ruby fluorescence scale. The ruby measurements yield pressures that are in good agreement with the Brillouin results. On average, the ruby fluorescence measurements produce pressures that are larger than the Brillouin determinations by 1.6%.

Original languageEnglish (US)
Pages (from-to)25-33
Number of pages9
JournalEarth and Planetary Science Letters
Issue number1-2
StatePublished - Jun 15 1998


ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

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