The elastic properties of single-crystal fayalite as determined by dynamical measurement techniques

Donald G. Isaak, Earl K. Graham, Jay D Bass, Hong Wang

Research output: Contribution to journalArticle

Abstract

We present new elasticity measurements on single-crystal fayalite and combine our results with other data from resonance, pulse superposition interferometry, and Brillouin scattering to provide a set of recommended values for the adiabatic elastic moduli Cij and their temperature variations. We use a resonance method (RPR) with specimens that were previously investigated by pulse superposition experiments. The nine Cij of fayalite are determined from three new sets of measurements. One set of our new Cij data is over the range 300-500 K. We believe that the relatively large discrep ncies found in some Cij are due in large part to specimen inhomogeneities (chemical and microstructural) coupled with differences in the way various techniques sample, rather than only systematic errors associated with experimental procedures or in the preparations of the specimens. Our recommendea Cij's (GPa) and (∂Cij/∂T)p (GPa/K) are:[Figure not available: see fulltext.] The resulting values for the isotropic bulk and shear moduli, Ks and μ, and their temperature derivatives are:Ks=134(4) GPa; μ=50.7(0.3) GPa; (∂Ks/∂T)p=-0.024(0.005) GPa/K; and (∂μ/∂T)p=-0.013(0.001) GPa/K. An important conclusion is that Ks increases as the Fe/(Fe+Mg) ratio in olivine is increased.

Original languageEnglish (US)
Pages (from-to)393-414
Number of pages22
JournalPure and Applied Geophysics PAGEOPH
Volume141
Issue number2-4
DOIs
StatePublished - Jun 1 1993

Keywords

  • Brillouin scattering
  • Fayalite
  • elastic moduli
  • olivine
  • pulse-superposition
  • resonance

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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