摘要
大量矿物电导率数据分析表明,矿物电导率存在Meyer-Neldel补偿规律,即同一矿物在不同物理、化学条件下测得电导率有很大差异,但其指前因子和活化能之间存在良好的线性关系.基于矿物电导率补偿规律,形成了从矿物电导率计算元素扩散系数的新方法,其计算结果与实验扩散数据符合较好.利用钙钛矿的电导率补偿关系,结合电磁测深结果,亦能获得更合理的地球深内部电导率结构.
An analysis of a large number of published data of electrical conductivity shows there exists Meyer-Neldel compensation law for electrical conductivity in minerals, which refers to a good linear correlation between the logarithm of pre-exponential factor and activation enthalpy for the same mineral in spite of different values obtained in different physical and chemical conditions. Based on the compensation effect for electrical conductivity in the minerals, a new method to estimate diffusion coefficient from electrical conductivity was developed and it is shown that the computed results with the new method are in good agreement with experimental diffusivity. Combined with the results of electromagnetic sounding, the compensation relation for electrical conductivities of perovskite was also used to present a relatively reasonable electrical structure in the Earth＇s lower mantle.
基金
国家自然科学基金(40374025
40537033)
教育部新世纪优秀人才支持计划(NCET-05-0553)资助
关键词
电导率
补偿规律
电磁测深
扩散
electrical conductivity
compensation law
electromagnetic sounding
diffusivity
