Thermal conductivity of NaCl,MgO, coesite and stishovite up to 40 kbar |
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| Authors: | Hideo Yukutake Mitshuhiko Shimada |
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| Institution: | Abuyama Seismological Observatory, Faculty of Science, Kyoto University, Takatsuki, Osaka, Japan |
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| Abstract: | The thermal conductivity of NaCl, MgO, coesite and stishovite have been measured as a function of pressures up to 40 kbar (4 Gpa) at room temperature. Polycrystalline coesite and stishovite were synthesized under high pressures and temperatures at our laboratory. An improved version of the comparative method suitable for the thermal conductivity measurement of small samples under high pressures was designed. The zero-pressure values are 0.0189 and 0.0412 cal. cm?1 s?1 °C?1 for coesite and stishovite, respectively. The thermal conductivities were found to increase linearly with pressure, and the increase rates relative to their zero-pressure values were 3.1, 0.68, 0.39 and 0.90% per kbar for NaCl, MgO, coesite and stishovite, respectively. On the thermal conductivity of coesite, the pressure dependence is small and the zero-pressure value is almost the same as that of polycrystalline quartz. On the other hand, the zero-pressure value of stishovite is 2.2 times as large as that of coesite. |
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