Influence of high conductive magnetite impurity on the electrical conductivity of dry olivine aggregates at high temperature and high pressure

	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
Source Publication	Minerals (IF:2.088[JCR-2016],2.034[5-Year])
Pages	1-14
Abstract	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.
Keyword	Electrical Conductivity Magnetite Olivine Aggregates Percolation Threshold High Temperature And High Pressure
Indexed By	SCI
Language	英语
Document Type	期刊论文
Identifier	http://ir.gyig.ac.cn/handle/42920512-1/10502
Collection	地球内部物质高温高压实验室
Affiliation	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
Recommended Citation 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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