TY - JOUR
T1 - Elasticity and sound velocities of polycrystalline Mg 3Al 2(SiO 4) 3 garnet up to 20 GPa and 1700 K
AU - Zou, Yongtao
AU - Irifune, Tetsuo
AU - Gréaux, Steeve
AU - Whitaker, Matthew L.
AU - Shinmei, Toru
AU - Ohfuji, Hiroaki
AU - Negishi, Ryo
AU - Higo, Yuji
PY - 2012/7/1
Y1 - 2012/7/1
N2 - 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.
AB - 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.
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U2 - 10.1063/1.4736407
DO - 10.1063/1.4736407
M3 - Article
AN - SCOPUS:84864146321
VL - 112
JO - Journal of Applied Physics
JF - Journal of Applied Physics
SN - 0021-8979
IS - 1
M1 - 014910
ER -