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Thermal diffusivities of MgSiO 3  perovskite (MgPv) and MgSiO 3  perovskite containing 2 wt% Al 2 O 3  (Al-MgPv) were measured at ambient conditions using the micro-spot heating angstrom method. The obtained values of thermal diffusivities of MgPv and Al-MgPv are 2.6 ± 0.1 and 2.4 ± 0.1 mm 2 /s, respectively. Present result for MgPv is much higher than previously reported value of 1.7 mm 2 /s. Substitution of aluminum into MgPv has little effect on its thermal diffusivity at ambient conditions, and such an impurity effect would remain insignificant at high pressures and high temperatures corresponding to the Earth’s lower mantle.

Thermal diffusivities of MgSiO 3 and Al-bearing MgSiO 3 perovskites