Physics
Scientific paper
Apr 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pepi..112..267a&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 112, Issue 3-4, p. 267-283.
Physics
17
Scientific paper
This is a review paper concerning the thermal pressure, PTH, of solids and the conditions under which it is independent of volume. When PTH is independent of V, the general equation of state (EoS) reduces fromP(V,T)=P1(V,0)+PTH(V,T)toP(V,T)=P1(V,0)+PTH,and thus is separated into two independent mathematical functions. P1(V,0) is the isothermal EoS. Four tests of thermoelastic data are shown to determine the T and V range in which PTH is independent of volume. Eighteen solids are examined. Most of these are minerals, but two metals, three alkali metals and three noble gases are also included. The focus is on three lower mantle minerals, MgSiO3, MgO, and CaSiO3. For these three minerals (∂PTH/∂V)T vanishes at conditions of the lower mantle, but PTH is a function of V at ambient conditions. However, for most solids, (∂PTH/∂V)T becomes zero at high temperature. The behavior of (∂PTH/∂V)T is apparently not correlated with such properties as crystal class, chemical composition, bonding type, and anharmonicity. The vanishing of (∂PTH/∂V)T is strictly a high temperature property of solids.
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