Thermal expansion of mantle and core materials at very high pressures

Details Thermal expansion of mantle and core materials at very high pressures Thermal expansion of mantle and core materials at very high pressures

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20.1103d&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 11, p. 1103-1106.

Physics

36

Earth Core, Earth Mantle, Magnesium Oxides, Minerals, Thermal Expansion, Thermal Shock, High Pressure, Hugoniot Equation Of State, Thermodynamic Properties

Scientific paper

Thermal expansivities (alpha) of three minerals and metallic Fe are presently constrained at pressures above 140 GPa from room temperature compression curves and measured Hugoniot temperatures. The expansivity values for MgO are consistent with several new and existing models for the pressure dependence of alpha. An extrapolation of epsilon-Fe to inner core conditions imply this metal's greater density than the inner core, implying that the inner core is not pure iron.

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