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Experimental Study on the Electrical Conductivity of Orthopyroxene at High Temperature and High Pressure under Different Oxygen Fugacities

查看全文 作　　者：DAI [1,2]Lidong;LI [1]Heping;LIU [3]Congqiang;SHAN [1]Shuangming;CUI [4]Tongdi;SU [1]Genli 高影响力作者 机构地区：[1]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高影响力机构 出　　处：《Acta Geologica Sinica(English Edition)》索引2005年第79卷第6期,共7页高影响力期刊 基　　金：This research project was granted by the Knowledge-Innovation Program sponsored by the Chinese Academy of Sciences(KZCX3-SW-124). 摘　　要：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 toconduct 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 clearthat: (1) within the measuring frequency range from 10? to 106 Hz, the complex impedance (R) is of intensive dependence 1on 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, theactivation enthalpy tends to increase whereas the electrical conductivity tends to decrease. The activation energy andactivation 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 withincreasing oxygen fugacity, while under given pressure the activation enthalpy tends to decrease with increasing oxygenfugacity; and (5) The sample’s small polarons mechanism has provided a reasonable explanations to the conductionbehavior at high temperature and high pressure. 关 键 词：斜方辉岩 导电率 温度 应力
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