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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。
Using AC impedance spectroscopy technique, with the YJ-3000t compact top-mounted high voltage equipment and Solartron-1260 impedance / gain-phase analyzer at 0.5-2.0 GPa, 573-873 K and 10-1-106 Hz, The conductivity of quartz sandstone was measured. The experimental results show that the real part, the imaginary part, the mode and the phase angle of the complex impedance of the sample have a strong dependence on the frequency in the measured frequency range. As the temperature increases, the conductivity increases, and the Arrhenius linear relationship between lgσT and 1 / T is obtained. Through the fitting calculation, the pre-exponential factor, activation enthalpy, activation energy, activation volume and other physical parameters were obtained to characterize the electrical properties of the sample. The impurity ion conduction mechanism provides a reasonable explanation for the conduction behavior of quartz sandstone under high temperature and high pressure.