LI Jia1,2, DAI Li-dong1*, LI He-ping1, HU Hai-ying1, HUI Ke-shi1,2, JIANG Jian-jun1,2, SUN Wen-qing1,2
(1. Key Laboratory of High-temperature and High-pressure Study of the Earth’s Interior, Institute of Geochemistry,
Chinese Academy of Sciences, Guiyang 550002, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China)
Abstract：By virtue of the complex impedance spectroscopy technique, the electrical conductivities of the quartz sandstone were performed using YJ-3000t 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.
Keywords: quartz sandstone; electrical conductivity; high temperature and high pressure; conduction mechanism
Email: dailidong_2014@hotmail.com
ACTA MINERALOGICA SINICA Vol. 35, No. 2, 2015, Page 154-158
