高温高压下滑石的电导率实验研究  

AN EXPERIMENTAL STUDY ON ELECTRICAL CONDUCTIVITY OF TALC AT HIGH TEMPERATURE AND HIGH PRESSURE

作　　者：朱茂旭[1] 谢鸿森[1] 郭捷[1] 许祖鸣[1] 

机构地区：[1]中国科学院地球化学研究所,贵阳550002

出　　处：《地球物理学报》2001年第3期429-435,共7页Chinese Journal of Geophysics

基　　金：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

摘　　要：在 1 0GPa和 2 0GPa、40 0～ 860℃条件下测定了滑石的电导率 .实验表明 ,增大压力 ,滑石的电导率增大 ,其导电机制为电子导电 ;在整个实验温度范围内电导率与T的关系都符合Arrhenius公式 ,滑石的脱水没有引起电导率的突然变化 ,表明并不是所有的含水矿物的脱水都会引起电导率的急剧上升 .电导率的急剧增加还可能与矿物的含水量、脱水后自由水含量及连通度等因素有关 .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.

关 键 词：高温高压 滑石 电导率 含水量 自由水量 连通度 电子导电 导电机制 

分 类 号：P578.958[天文地球—矿物学]