【摘要】 利用交流阻抗谱实验技术,在0.5~2.0 GPa、573~873 K和10-1~106 Hz条件下,借助YJ-3000t紧装式六面顶高压设备和Solartron-1260阻抗/增益-相位分析仪测定了石英砂岩的电导率。实验结果表明:在测定的频率范围,样品的复阻抗的实部、虚部、模和相角对频率有很强的依赖性。随着温度升高,电导率增大,lgσT与1/T之间符合Arrhenius线性关系。通过拟合计算,获得了表征样品电学性质的指前因子、活化焓、活化能、活化体积等物性参数。杂质离子导电机制对高温高压下石英砂岩的导电行为提供了合理的解释。更多还原

【Abstract】 By virtue of the complex impedance spectroscopy technique, the electrical conductivities of the quartz sandstone were performed using YJ-3000 t multi-anvil press and Solartron-1260 impedance/ gain-phase analyser under conditions of 0.5–2.0 GPa, 573–873 K and 10-1–106 Hz. The results indicate that the real part, imaginary part, modulus and phase angel of complex impedance spectra depend strongly on a change in frequency. As temperature increases, electrical conductivity increases. The logarithm of the electrical conductivity and the reciprocal temperature satisfy a linear Arrhenius Relation. Fitting calculations were carried out in order to obtain a series of physical parameters of the sample, such as the pre-exponential factor, activation energy, activation volume and so on. It is suggested that the main conduction mechanism for quartz sandstone is ionic impurity conduction, which provides a reasonable explanation for the electrical behaviour of the sample at high temperature and high pressure.更多还原