1.0GPa下榴闪岩电导率的研究  

Electrical Conductivity of Amphibole Eclogite at 1.0GPa

作　　者：李丹阳[1] 王多君[1] 郭颖星[1] 

机构地区：[1]中国科学院计算地球动力学重点实验室,中国科学院大学,北京100049

出　　处：《高压物理学报》2014年第2期152-160,共9页Chinese Journal of High Pressure Physics

基　　金：中国科学院;国家外专局创新团队国际合作伙伴计划(KZZD-EW-TZ-19);国家自然科学基金(41074063;41374095);中国科学院知识创新工程重点方向性项目(KZCX2-YW-QN608)

摘　　要：在1.0GPa压力条件下,采用交流阻抗谱法在10^-1-10^6 Hz频率范围内对陕西商南地区的榴闪岩样品进行了电阻抗测量。实验结果表明,榴闪岩的复阻抗对温度和频率表现出明显的依赖性。在给定温度下,复阻抗的模随频率的增大而减小,相角随频率的增大先减小后变大;在给定频率下,复阻抗的模随温度的升高而减小,相角随温度的升高而增大。榴闪岩电导率值的范围为10^-6-1S/m,并且电导率与温度之间满足Arrhenius关系式。低温区活化焓约为33-58kJ/mol,高温区活化焓约为108-163kJ/mol。榴闪岩的导电机制可能是Fe^2＋与Fe^3＋之间的电子跳跃。We measured the electrical impedance spectra of two amphibole eclogite samples collected from Shangnan county of Shanxi province at 1.0 GPa within the frequency range of 10^-1-10^6 Hz. The results indicate that the complex impedance depends on the frequency and temperature. At a given temperature,the modulus of complex impedance decreases with the increasing frequency, and the phase angle first decreases and then increases with the increasing frequency. At a given frequency,the modulus decreases with the increasing temperature and the phase angle increases with the increasing temperature. The range of electrical conductivity value of amphibole eclogite is 10^-6 -1 S/m, and the relationship between conductivity and temperature can be fitted by Arrhenius relation. The activation enthalpies derived are 33-58 kJ/mol at low temperature and 108-163 kJ/mol at high temperature, respectively. The conduction mechanism of amphibole eclogite is likely related to the electron hopping between Fe^2＋ and Fe^3＋.

关 键 词：高温高压 榴闪岩 电导率 

分 类 号：O521.2[理学—高压高温物理]