A simplified model for predicting high pressure thermal expansion of MgO

Details A simplified model for predicting high pressure thermal expansion of MgO A simplified model for predicting high pressure thermal expansion of MgO

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995georl..22.1297w&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 22, no. 10, p. 1297-1300

Physics

6

Earth Mantle, High Pressure, Periclase, Thermal Expansion, Thermodynamics, Bulk Modulus, Free Energy, Mathematical Models, Temperature Dependence

Scientific paper

Thermal expansion of MgO, periclase, is approximated by contributions from a quasi-harmonic perfect crystal and its equilibrium high temperature/pressure defects. We demonstrate that the influence of thermal defects on high pressure thermal expansion is very small and may be neglected at lower mantle conditions. Following that, a simple relationship has been obtained between high pressure thermal expansion and the thermal expansion of a quasi-harmonic perfect crystal at zero pressure. Our estimation of MgO thermal expansion at the core-mantle boundary is 9.36x10(exp -6)/K.

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