Single-crystal elasticity of stishovite: New experimental data obtained using high-frequency resonant ultrasound spectroscopy and a Gingham check structure model

Akira Yoneda, Titus Cooray, Anton Shatskiy

    Research output: Contribution to journalArticlepeer-review

    10 Citations (Scopus)

    Abstract

    Single-crystal elasticity of stishovite was examined using a new experimental technique and an empirical macroscopic model. Employing high-frequency resonant ultrasound spectroscopy, single-crystal elastic constants of stishovite were determined: C 11=443(3), C 33=781(4), C 12=193(2), C 23=199(2), C 44=256(2), and C 33=316(2)GPa. The frequency range of the resonant ultrasound spectroscopy techniques was 6-20MHz, which is much lower than the ~10GHz range of the Brillouin scattering technique. Of the elastic constants, the shear elastic constants C 44 and C 66 are consistent with the average value of the previously mentioned Brillouin scattering. Conversely, the four elastic constants, C 11, C 33, C 12, and C 23, slightly deviate outside the range of previous Brillouin scattering results. The present results, except those for C 12, are consistent with recent lattice dynamic analysis of inelastic X-ray scattering data. The adiabatic bulk modulus was calculated as 298GPa, which is smaller and more consistent with the result of compression experiments than any other Brillouin scattering results (301-312GPa). The present result shows greater P-wave velocity anisotropy (24.7%) than any preceding work. To understand the unique elastic properties of stishovite, the Gingham check model was proposed and examined. The result shows that the octahedron of 6-coordinated Si in stishovite crystal has stiffness comparable to that of diamond.

    Original languageEnglish
    Pages (from-to)80-86
    Number of pages7
    JournalPhysics of the Earth and Planetary Interiors
    Volume190-191
    DOIs
    Publication statusPublished - Jan 2012

    Keywords

    • Acoustic velocity
    • Bulk modulus
    • Elasticity
    • Finite element method
    • Resonant ultrasound spectroscopy
    • Stishovite

    ASJC Scopus subject areas

    • Astronomy and Astrophysics
    • Geophysics
    • Physics and Astronomy (miscellaneous)
    • Space and Planetary Science

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