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- W1828129136 abstract "The sound velocities and single-crystal elastic moduli of spinel-structured g-Mg2SiO4 were measured to 873 K by Brillouin spectroscopy using a new high-temperature cell designed for singlecrystal measurements. These are the first reported acoustic measurements of g-Mg2SiO4 elasticity at high temperatures. A linear decrease of elastic moduli and sound velocities with temperature adequately describes the data. The adiabatic bulk modulus, KS, shear modulus, m, and respective temperature derivatives for γ-Mg2SiO4 are: KS = 185(3) GPa, μ = 120.4(2.0) GPa, (∂KS/∂T)P = -0.024(3) GPa/K and (∂m/∂T)P = -0.015(2) GPa/K. Extrapolation of our data to transition zone pressures and temperatures indicates that the shear and compressional impedance contrasts associated with β- → ∂-(Mg,Fe)2SiO4 transition are sufficient to produce an observable discontinuity at 520 km depth, even with a moderate (30-50%) amount of olivine" @default.
- W1828129136 created "2016-06-24" @default.
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- W1828129136 date "2000-02-01" @default.
- W1828129136 modified "2023-09-27" @default.
- W1828129136 title "Sound velocities and elastic properties of γ-Mg<sub>2</sub>SiO<sub>4</sub>to 873 K by Brillouin spectroscopy" @default.
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- W1828129136 doi "https://doi.org/10.2138/am-2000-2-306" @default.
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