Abstract
Ultrasonic interferometry measurements in conjunction with in situ X‐ray techniques have been used to measure compressional and shear wave velocities and densities of MgSiO3perovskite (Mg‐Pv) and Mg0.95Fe0.042+Fe0.013+SiO3perovskite ((Mg, Fe)‐Pv) in the multianvil at pressures up to 25 GPa and temperatures to 1200 K. Data for Mg‐Pv are consistent with previous studies and the (Mg, Fe)‐Pv sample has almost identical shear properties to Mg‐Pv. The adiabatic bulk modulus,Ks, for (Mg, Fe)‐Pv, however, is found to be substantially lower than Mg‐Pv, with a refined value of 236 GPa and a pressure derivative of 4.7. It is proposed that this lowKSvalue result from a change in the elasticity of Fe‐bearing perovskite at low pressures <30 GPa. High temperature data are consistent with recent models and it is shown that the obtained elastic properties of (Mg, Fe)‐Pv are not inconsistent with a lower mantle of bulk silicate Earth composition.
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