Elasticity of single crystal and polycrystalline MgSiO3 perovskite by Brillouin spectroscopy
Article first published online: 26 MAR 2004
Copyright 2004 by the American Geophysical Union.
Geophysical Research Letters
Volume 31, Issue 6, March 2004
How to Cite
2004), Elasticity of single crystal and polycrystalline MgSiO3 perovskite by Brillouin spectroscopy, Geophys. Res. Lett., 31, L06620, doi:10.1029/2004GL019559., , and (
- Issue published online: 26 MAR 2004
- Article first published online: 26 MAR 2004
- Manuscript Accepted: 3 MAR 2004
- Manuscript Revised: 27 FEB 2004
- Manuscript Received: 22 JAN 2004
 The elastic moduli of MgSiO3 perovskite have been measured on both single-crystal and polycrystalline samples by Brillouin spectroscopy at ambient conditions. The aggregate elastic moduli calculated from measured single-crystal elastic moduli and from the average polycrystalline velocities are in excellent agreement. This convincingly demonstrates that accurate values of elastic moduli can be obtained for polycrystalline samples of dense anisotropic materials by Brillouin spectroscopy. Our new values of the bulk modulus (KS = 253(3) GPa) and shear modulus (μ = 175(2) GPa) are ∼4% and ∼1% lower than commonly accepted values for end-member MgSiO3 perovskite (KS = 264 GPa, μ = 177 GPa). These lower elastic moduli suggest that the pressure, temperature, and compositional dependence of elastic moduli and wave velocities for magnesian silicate perovskite must be reevaluated in order to obtain reliable constraints on the mantle chemistry and thermal structure.