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| Influence of high conductive magnetite impurity on the electrical conductivity of dry olivine aggregates at high temperature and high pressure | |
| Lidong Dai; Haiying Hu; Wenqing Sun; Heping Li; Changcai Liu; Mengqi Wang | |
| 2019 | |
| 发表期刊 | Minerals
 |
| 页码 | 1-14 |
| 摘要 | The electrical conductivity of dry sintered olivine aggregates with various contents of magnetite (0, 3, 5, 7, 10, 20, and 100 vol. %) was measured at temperatures of 873–1273 K and a pressure of 2.0 GPa within a frequency range of 0.1–106 Hz. The changes of the electrical conductivity of the samples with temperature followed an Arrhenius relation. The electrical conductivity of the sintered olivine aggregates increased as the magnetite-bearing content increased, and the
activation enthalpy decreased, accordingly. When the content of interconnected magnetite was higher than the percolation threshold (~5 vol. %), the electrical conductivity of the samples was markedly enhanced. As the pressure increased from 1.0 to 3.0 GPa, the electrical conductivity of the magnetite-free olivine aggregates decreased, whereas the electrical conductivity of the 5 vol. % magnetite-bearing sample increased. Furthermore, the activation energy and activation volume of the 5 vol. % magnetite-bearing sintered olivine aggregates at atmospheric pressure were calculated to be 0.16 ± 0.04 eV and d1.50 ± 0.04 cm3/mole respectively. Due to the high value of percolation threshold (~5 vol. %) in the magnetite impurity sample, our present results suggest that regional high conductivity anomalies in the deep Earth’s interior cannot be explained by the presence of the interconnected magnetite-bearing olivine aggregates. |
| 关键词 | Electrical Conductivity Magnetite Olivine Aggregates Percolation Threshold High Temperature And High Pressure |
| 收录类别 | SCI |
| 语种 | 英语 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.gyig.ac.cn/handle/42920512-1/10502 |
| 专题 | 地球内部物质高温高压实验室 |
| 作者单位 | 1.Key Laboratory of High-temperature and High-pressure Study of the Earth’s Interior, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, Guizhou 550002, China 2.University of Chinese Academy of Sciences, Beijing 100039, China |
| 推荐引用方式 GB/T 7714 | Lidong Dai；Haiying Hu；Wenqing Sun；Heping Li；Changcai Liu；Mengqi Wang. Influence of high conductive magnetite impurity on the electrical conductivity of dry olivine aggregates at high temperature and high pressure[J]. Minerals,2019:1-14. |
| APA | Lidong Dai；Haiying Hu；Wenqing Sun；Heping Li；Changcai Liu；Mengqi Wang.(2019).Influence of high conductive magnetite impurity on the electrical conductivity of dry olivine aggregates at high temperature and high pressure.Minerals,1-14. |
| MLA | Lidong Dai；Haiying Hu；Wenqing Sun；Heping Li；Changcai Liu；Mengqi Wang."Influence of high conductive magnetite impurity on the electrical conductivity of dry olivine aggregates at high temperature and high pressure".Minerals (2019):1-14. |
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