Heat capacity of MgSiO3 perovskite

Details Heat capacity of MgSiO3 perovskite Heat capacity of MgSiO3 perovskite

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20..105a&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 2, p. 105-108.

Physics

50

Earth Mantle, Perovskites, Specific Heat, Entropy, Magnesium Compounds, Silicon Oxides, X Ray Diffraction

Scientific paper

Heat capacity of MgSiO3 perovskite has been measured in the temperature range 140-295 K by differential scanning calorimetry. The Kieffer model approach has been used to calculate the heat capacity beyond the measured temperature range. The estimated entropy of MgSiO3 perovskite is 57.2 +/- 1.0 J/mol. K at 298 K which is higher than that of ilmenite, in accord with the negative pressure-temperature slope for the ilmenite-perovskite transition. From the heat capacity thermodynamic Debye temperature of MgSiO3 perovskite is evaluated to be 980 +/- 15 K at 298 K and 1030 +/- 20 K at temperatures above about 700 K. Thermodynamic Gruneisen parameter of MgSiO3 perovskite at 30 GPa and above 1000 K is also estimated as 1.45 +/- 0.15. An adiabatic temperature profile in the pyrolitic lower mantle is calculated with the average gradient of 0.32 +/- 0.04 K/km. The temperature at the top of the D-double prime layer is estimated to be 2500 +/- 100 K.

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