Elasticity and sound velocities of polycrystalline Mg 3Al 2(SiO 4) 3 garnet up to 20 GPa and 1700 K

Yongtao Zou, Tetsuo Irifune, Steeve Gréaux, Matthew L. Whitaker, Toru Shinmei, Hiroaki Ohfuji, Ryo Negishi, Yuji Higo

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Abstract

Elastic wave velocities of synthetic polycrystalline Mg 3Al 2(SiO 4) 3 garnet have been successfully measured to 20 GPa and temperatures up to 1700 K by ultrasonic interferometry combined with energy-dispersive synchrotron x-ray diffraction in a Kawai-type multi-anvil apparatus. Compressional (Vp) and shear (Vs) wave velocities as well as the adiabatic bulk (Ks) and shear (G) moduli exhibit monotonic increase with increasing pressure and decrease with increasing temperature, respectively. Two-dimensional (P-T) linear fittings of the present data yield the following parameters: K S0 170.0(2) GPa, Ks/P 4.51(2), Ks/T -0.0170(1) GPa/K, G 0 93.2(1) GPa, G/P 1.51(2), and G/T -0.0107(1) GPa/K, which is in good agreement with the earlier results by Brillouin scattering and/or ultrasonic measurements at relatively low P-T conditions. The observed linear pressure and temperature dependence in both Vp and Vs is in contrast to the non-linear behavior of Vp and Vs for majorite garnet with the pyrolite composition, in particular for Vs.

Original languageEnglish
Article number014910
JournalJournal of Applied Physics
Volume112
Issue number1
DOIs
Publication statusPublished - 2012 Jul 1
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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