Lattice conductivities of single-crystal and polycrystalline materials at mantle pressures and temperatures

Physics

Scientific paper

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Scientific paper

Lattice thermal conductivities have been measured for single-crystal quartz, olivine and sodium chloride, and for three dunites and polycrystalline coesite over the temperature range 350-650 K and pressure range 2-5.6 GPa. Tables of data are presented giving conductivities, pressure coefficients at various temperatures and inverse temperature coefficients at various pressures; in all cases the coefficients are positive. Although the conductivities of crystalline quartz with heat flowing parallel and perpendicular to the optic axis change markedly with pressure and temperature, the anisotropy ratio shows only a small change.

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