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《Chinese Journal of Geophysics》 2001-03
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AN EXPERIMENTAL STUDY ON ELECTRICAL CONDUCTIVITY OF TALC AT HIGH TEMPERATURE AND HIGH PRESSURE

ZHU MAO XU\ XIE HONG SEN\ GUO JIE\ XU ZU MING (Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China)  
The electrical conductivity of talc is measured at pressure of 1.0 GPa and 2.0 GPa and temperature of 400—860℃. The results show that the electrical conductivity of talc increases with increasing pressure, and the electrical conduction mechanism in talc is electronic. log σ vs. 1/ T can be well fitted to the Arrhenius equation up to maximum temperature in the experiments, at which talc has dehydrated. The dehydration of talc at high pressure does not result in an abrupt increase in electrical conductivity, implying that not every mineral dehydration process can result in an abrupt increase in electrical conductivity. Abrupt increase in electrical conductivity with regard to mineral dehydration for some hydrous minerals, for example serpentine, is probably related to the amount of structural water and the extent of connectivity of free water after dehydration.
【Fund】: 国家自然科学基金资助项目!( 4990 4 0 0 5 4 9672 0 99);; 中国科学院高温高压地球动力学开放实验室资助项目
【CateGory Index】: P631.3
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