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Evidence for Grain Boundary Transport from Impedance Spectroscopy of Gabbro at 1-2 GPa up to 890°C |
| BAI Li-Ping1;DU Jian-Guo1;LIU Wei1;GUO Jie2;ZHOU Wen-Ge2 |
| 1Center for Analysis and Prediction, China Seismological Bureau, Beijing 100036
2Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002 |
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| Cite this article: |
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BAI Li-Ping, DU Jian-Guo, LIU Wei et al 2003 Chin. Phys. Lett. 20 2074-2077 |
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Abstract Impedance spectra of gabbro were measured at 1-2 GPa and up to 890°C with applied frequency of 12 to 105Hz. At temperatures below 680°C, only one impedance arc corresponding to the grain interior conduction process occurs. Owing to the grain boundary transport with increasing temperature, the impurities occur at the grain boundaries, resulting in the second arc corresponding to the grain boundary conduction process over the frequency range of 12 to 103Hz above 680°C, and the resistivities of the grain interior and the grain boundary conduction mechanisms add in series. The total conductivity of this rock is dominated by the grain interior conductivity and the impurities have no significant effect on the total electrical conductivities.
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| Keywords:
91.60.-x
84.37.+q
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Published: 01 November 2003
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| PACS: |
91.60.-x
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(Physical properties of rocks and minerals)
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84.37.+q
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(Measurements in electric variables (including voltage, current, resistance, capacitance, inductance, impedance, and admittance, etc.))
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