| Experimental Study on the Electrical Conductivity of Orthopyroxene atHigh Temperature and High Pressure under Different Oxygen Fugacities |
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| 作者姓名： | DAI Lidong LI Heping LIU Congqiang SHAN Shuangming CUI Tongdi and SU Genli Laboratory of the Earth’s Interior Materials and Fluid Geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang Guizhou Graduate School of Chinese Academy of Sciences Beijing Institute of Geochemistry Chinese Academy of Sciences Guiyang Guizhou University of Guizhou Guiyang Guizhou |
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| 作者单位： | DAI Lidong1，LI Heping1，LIU Congqiang3，SHAN Shuangming1，2 CUI Tongdi4 and SU Genli11 Laboratory of the Earth’s Interior Materials and Fluid Geochemistry，Institute of Geochemistry，Chinese Academy of Sciences，Guiyang，Guizhou 550002; 2 Graduate School of Chinese Academy of Sciences，Beijing 100039 3 Institute of Geochemistry，Chinese Academy of Sciences，Guiyang，Guizhou 550002 4 University of Guizhou，Guiyang，Guizhou 550004 |
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| 基金项目： | 中国科学院知识创新工程项目 |
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| 摘 要： | 1 Introduction recognized and accepted by more and more experts engaged in experimental research at high temperature and In-situ laboratory measurement of the electricity of high pressure. This method has been regardedgeological materials at high temperature and high pressure internationally as the most advanced one for the in-situis an important approach to revealing the composition, laboratory measurement of the electric properties ofstructure and properties of materials in the deep interior…
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| 关 键 词： | 斜方辉岩 导电率 温度 应力 |
| 收稿时间： | 2005-04-15 |
| 修稿时间： | 2005-07-18 |
Experimental Study on the Electrical Conductivity of Orthopyroxene atHigh Temperature and High Pressure under Different Oxygen Fugacities |
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| Authors: | DAI Lidong LI Heping LIU Congqiang SHAN Shuangming CUI Tongdi SU Genli |
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| Abstract: | Abstract At presure 1.0–4.0 GPa and temperature 1073–1423 K and under oxygen partial pressure conditions, a YJ‐3000t multi‐anvil solid high‐pressure apparatus and Sarltron‐1260 Impedance/Gain‐Phase analyzer were employed to conduct an in‐situ measurement of the electrical conductivity of orthopyroxene. The buffering reagents consist of Ni+NiO, Fe+Fe3O4, Fe+FeO and Mo+MoO2 in order to control the environmental oxygen fugacity. Experimental results made clear that: (1) within the measuring frequency range from 10?1 to 106 Hz, the complex impedance (R) is of intensive dependence on the frequency; (2) The electrical conductivity (σ) tends to increase along to the rise of temperature (T), and Log σ vs. 1/T fit the Arrenhius linear relations; (3) Under the control of oxygen buffer Fe+Fe3O4> with the rise of pressure, the activation enthalpy tends to increase whereas the electrical conductivity tends to decrease. The activation energy and activation volume of the main current carriers of orthopyroxene have been obtained, which are (1.715±0.035) eV and (0.03±0.01) cm3/mol, respectively; (4) Under given pressure and temperature, the electrical conductivity tends to increase with increasing oxygen fugacity, while under given pressure the activation enthalpy tends to decrease with increasing oxygen fugacity; and (5) The sample's small polarons mechanism has provided a reasonable explanations to the conduction behavior at high temperature and high pressure. |
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| Keywords: | orthopyroxene high temperature and high pressure electrical conductivity oxygen fugacity small polaron |
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