Thermal diffusivity of MgSiO3 perovskite

Details Thermal diffusivity of MgSiO3 perovskite Thermal diffusivity of MgSiO3 perovskite

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18..239o&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 18, Feb. 1991, p. 239-242.

Physics

36

Earth Mantle, Magnesium Compounds, Perovskites, Silicates, Thermal Conductivity, Thermal Diffusivity, Thermodynamic Properties, Transport Properties

Scientific paper

Thermal diffusivity of MgSiO3 perovskite has been measured in the temperature range of 160 K to 340 K, using a sample synthesized in a uniaxial split-sphere high-pressure apparatus. At 300 K, the thermal diffusivity of perovskite is 1.72 x 10 to the -6th sq m/sec, from which the thermal conductivity is evaluated to be 5.1 W/m per K. The model calculation shows that lattice thermal conductivity of the perovskite increases by a factor of 4 with depth throughout the lower mantle and reaches to 12 W/m per K in the vicinity of the mantle-core boundary. The D-double-prime layer might not be a thermal boundary layer insulating the high core-temperature, if this layer mainly consists of the perovskite.

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