Elastic properties of polycrystalline MgSiO 3 perovskite were determined by means of resonance sphere technique at temperatures from 258 to 318 K under atmospheric pressure. The temperature derivatives of adiabatic bulk (∂ K S /∂ T ) P and shear moduli (∂ G /∂ T ) P are −0.029(2) GPa/K and −0.024(1) GPa/K, respectively. Applying the present results in interpretation of seismological observations, we suggest that the chemical composition of the earth's lower mantle is pyrolitic at the potential temperature of 1600 K.
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Aizawa et al. (2004) studied this question.
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