DOI: 10.1002/grl.50471
论文题名: An experimental study of the influence of graphite on the electrical conductivity of olivine aggregates
作者: Wang D. ; Karato S.-I. ; Jiang Z.
刊名: Geophysical Research Letters
ISSN: 0094-9007
EISSN: 1944-8738
出版年: 2013
卷: 40, 期: 10 起始页码: 2028
结束页码: 2032
语种: 英语
英文关键词: electrical conductivity
; graphite
; olivine
; percolation threshold
Scopus关键词: Crystallographic orientations
; Electrical conductivity
; Equilibrium morphology
; Experimental studies
; Graphite crystal
; High conductivity
; High-pressure and temperatures
; Percolation thresholds
; Aggregates
; Crystal orientation
; Diamonds
; Electric conductivity
; Morphology
; Olivine
; Percolation (computer storage)
; Percolation (fluids)
; Graphite
; anisotropy
; crystal structure
; crystallography
; electrical conductivity
; experimental study
; geometry
; graphite
; high pressure
; morphology
; percolation
; temperature effect
; threshold
英文摘要: Presence of graphite is one of the mechanisms to explain enhanced electrical conductivity. Because the conductivity of graphite is highly anisotropic and the connectivity of graphite depends strongly on the geometry of the crystals, the key issue is the geometry of graphite in a rock including their crystallographic orientation and the shape of graphite crystals. We explored the role of graphite on electrical conductivity in olivine-rich aggregates. To obtain well-defined results, we conducted an experimental study at high pressure and temperature conditions. Olivine aggregates containing diamonds were annealed to transform diamond to graphite with nearly equilibrium morphology. Graphite formed by the transformation from diamond has thin disk-shape morphology, the plane being the highly conductive (0001) plane. When the concentration of graphite exceeds the percolation threshold (∼ 1 wt%), electrical conductivity is significantly enhanced. Some of the observed high conductivity regions may represent regions of high concentration of graphite. © 2013 American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84879925466&doi=10.1002%2fgrl.50471&partnerID=40&md5=0160c229c0abbe035d9833f2f4700104
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6271
Appears in Collections: 气候减缓与适应
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作者单位: Key Laboratory of Computational Geodynamics, University of Chinese Academy of Sciences, Beijing, China
Recommended Citation:
Wang D.,Karato S.-I.,Jiang Z.. An experimental study of the influence of graphite on the electrical conductivity of olivine aggregates[J]. Geophysical Research Letters,2013-01-01,40(10).