Effect of Al3+ and H+ on the elastic properties of stishovite

Dmitry L. Lakshtanov, Konstantin D. Litasov, Stanislav V. Sinogeikin, Holger Hellwig, Jie Li, Eiji Ohtani, Jay D. Bass

Research output: Contribution to journalArticle

Abstract

X-ray diffraction, Brillouin, and Raman scattering measurements were performed on Al3+ and H+-bearing stishovite at ambient conditions. Samples with different Al3+ and H+ contents were used to examine the effects of these minor constituents on the density, acoustic velocities, single-crystal and aggregate elastic moduli. The X-ray diffraction and compositional data suggest that the incorporation mechanism of Al3+ into stishovite involves the formation of oxygen vacancies, in addition to the incorporation H+ in the structure. Our data show an overall linear decrease of the acoustic velocities, single crystal (cij) and aggregate (Ko, Go) elastic moduli as a function of Al3+ concentrations. For the sample of stishovite containing 6.07(5) wt% Al2O3 and 0.24(2) wt% H2O we obtained: zero-pressure adiabatic bulk modulus, Kso = 290(3) GPa, and the shear modulus, Gso = 207(2) GPa, with a calculated density of ρ = 4.16(1) g/cm3 based on X-ray diffraction. Stishovite containing 4.37(12) wt% Al2O3 and 0.29(3) wt% H2O possesses higher aggregate moduli: Kso = 296(3) GPa and Gso = 213(2) GPa, with a calculated density of ρ = 4.21(1) g/cm3 based on X-ray diffraction. We conclude that the formation of oxygen vacancies has a stronger effect on the density and thus elastic properties of stishovite than does the incorporation of hydrogen.

Original languageEnglish (US)
Pages (from-to)1026-1030
Number of pages5
JournalAmerican Mineralogist
Volume92
Issue number7
DOIs
StatePublished - Jul 1 2007

Keywords

  • Aluminum
  • Brillouin spectroscopy
  • Elasticity
  • Hydrogen
  • Mantle
  • Oxygen vacancies
  • Stishovite

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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    Lakshtanov, D. L., Litasov, K. D., Sinogeikin, S. V., Hellwig, H., Li, J., Ohtani, E., & Bass, J. D. (2007). Effect of Al3+ and H+ on the elastic properties of stishovite. American Mineralogist, 92(7), 1026-1030. https://doi.org/10.2138/am.2007.2294