An experimental study of the influence of graphite on the electrical conductivity of olivine aggregates
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...
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| Veröffentlicht in: | Geophysical research letters 2013-05, Vol.40 (10), p.2028-2032 |
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| creator | Wang, Duojun Karato, Shun-ichiro Jiang, Zhenting |
| description | 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.
Key Points
Graphite formed from diamond at high P,T has thin disk‐shape morphologyFor graphite to enhance conductivity depends on volume fraction and geometryHigher carbon content may explain the observed high conductivity in some regions |
| doi_str_mv | 10.1002/grl.50471 |
| format | Article |
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Key Points
Graphite formed from diamond at high P,T has thin disk‐shape morphologyFor graphite to enhance conductivity depends on volume fraction and geometryHigher carbon content may explain the observed high conductivity in some regions</description><identifier>ISSN: 0094-8276</identifier><identifier>EISSN: 1944-8007</identifier><identifier>DOI: 10.1002/grl.50471</identifier><language>eng</language><publisher>Washington: Blackwell Publishing Ltd</publisher><subject>Aggregates ; Anisotropy ; Annealing ; Conductivity ; Crystallography ; Crystals ; Diamonds ; Electrical conductivity ; Electrical resistivity ; Genetic transformation ; Geometry ; Graphite ; High pressure ; Mathematical morphology ; Morphology ; Olivine ; Orientation ; Percolation ; percolation threshold ; Pressure ; Regions ; Resistivity ; Rocks ; Shape ; Temperature ; Temperature effects</subject><ispartof>Geophysical research letters, 2013-05, Vol.40 (10), p.2028-2032</ispartof><rights>2013. American Geophysical Union. All Rights Reserved.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a5201-bd36a846817e6d2b92d40ba441a391dc7d346f509e68fc6bfec01761f69a7ef63</citedby><cites>FETCH-LOGICAL-a5201-bd36a846817e6d2b92d40ba441a391dc7d346f509e68fc6bfec01761f69a7ef63</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1002%2Fgrl.50471$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1002%2Fgrl.50471$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>314,780,784,1417,1433,11514,27924,27925,45574,45575,46409,46468,46833,46892</link.rule.ids></links><search><creatorcontrib>Wang, Duojun</creatorcontrib><creatorcontrib>Karato, Shun-ichiro</creatorcontrib><creatorcontrib>Jiang, Zhenting</creatorcontrib><title>An experimental study of the influence of graphite on the electrical conductivity of olivine aggregates</title><title>Geophysical research letters</title><addtitle>Geophys. Res. Lett</addtitle><description>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.
Key Points
Graphite formed from diamond at high P,T has thin disk‐shape morphologyFor graphite to enhance conductivity depends on volume fraction and geometryHigher carbon content may explain the observed high conductivity in some regions</description><subject>Aggregates</subject><subject>Anisotropy</subject><subject>Annealing</subject><subject>Conductivity</subject><subject>Crystallography</subject><subject>Crystals</subject><subject>Diamonds</subject><subject>Electrical conductivity</subject><subject>Electrical resistivity</subject><subject>Genetic transformation</subject><subject>Geometry</subject><subject>Graphite</subject><subject>High pressure</subject><subject>Mathematical morphology</subject><subject>Morphology</subject><subject>Olivine</subject><subject>Orientation</subject><subject>Percolation</subject><subject>percolation threshold</subject><subject>Pressure</subject><subject>Regions</subject><subject>Resistivity</subject><subject>Rocks</subject><subject>Shape</subject><subject>Temperature</subject><subject>Temperature effects</subject><issn>0094-8276</issn><issn>1944-8007</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2013</creationdate><recordtype>article</recordtype><recordid>eNp9kUFrFDEYhoMouNYe_AcDXvQw7ZdJJpkcS7G7wqLQagUvIZv5Mp2aZtYko91_b7qrHgR7yku-5_kIeQl5ReGEAjSnQ_QnLXBJn5AFVZzXHYB8ShYAquRGiufkRUq3AMCA0QUZzkKF91uM4x2GbHyV8tzvqslV-QarMTg_Y7D4cDFEs70Zc8lhP0SPNsfRFslOoZ9tHn-Mee9OvsSAlRmGiIPJmF6SZ874hMe_zyPy-eLdp_NVvf64fH9-tq5N2wCtNz0TpuOioxJF32xU03PYGM6pYYr2VvaMC9eCQtE5KzYOLVApqBPKSHSCHZE3h73bOH2fMWV9NyaL3puA05w0bTnlwBrZFfT1P-jtNMdQXqepoiBFxxU8SgneQCOgbQr19kDZOKUU0elt-VETd5qCfihGl2L0vpjCnh7Yn6PH3f9Bvbxc_zHqgzGmjPd_DRO_aSGZbPWXD0u9ulzyK3X9Va_YL8SUniw</recordid><startdate>20130528</startdate><enddate>20130528</enddate><creator>Wang, Duojun</creator><creator>Karato, Shun-ichiro</creator><creator>Jiang, Zhenting</creator><general>Blackwell Publishing Ltd</general><general>John Wiley & Sons, Inc</general><scope>BSCLL</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7TG</scope><scope>7TN</scope><scope>8FD</scope><scope>F1W</scope><scope>FR3</scope><scope>H8D</scope><scope>H96</scope><scope>KL.</scope><scope>KR7</scope><scope>L.G</scope><scope>L7M</scope><scope>7SR</scope><scope>JG9</scope></search><sort><creationdate>20130528</creationdate><title>An experimental study of the influence of graphite on the electrical conductivity of olivine aggregates</title><author>Wang, Duojun ; Karato, Shun-ichiro ; Jiang, Zhenting</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a5201-bd36a846817e6d2b92d40ba441a391dc7d346f509e68fc6bfec01761f69a7ef63</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2013</creationdate><topic>Aggregates</topic><topic>Anisotropy</topic><topic>Annealing</topic><topic>Conductivity</topic><topic>Crystallography</topic><topic>Crystals</topic><topic>Diamonds</topic><topic>Electrical conductivity</topic><topic>Electrical resistivity</topic><topic>Genetic transformation</topic><topic>Geometry</topic><topic>Graphite</topic><topic>High pressure</topic><topic>Mathematical morphology</topic><topic>Morphology</topic><topic>Olivine</topic><topic>Orientation</topic><topic>Percolation</topic><topic>percolation threshold</topic><topic>Pressure</topic><topic>Regions</topic><topic>Resistivity</topic><topic>Rocks</topic><topic>Shape</topic><topic>Temperature</topic><topic>Temperature effects</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Wang, Duojun</creatorcontrib><creatorcontrib>Karato, Shun-ichiro</creatorcontrib><creatorcontrib>Jiang, Zhenting</creatorcontrib><collection>Istex</collection><collection>CrossRef</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Oceanic Abstracts</collection><collection>Technology Research Database</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Engineering Research Database</collection><collection>Aerospace Database</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Civil Engineering Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>Engineered Materials Abstracts</collection><collection>Materials Research Database</collection><jtitle>Geophysical research letters</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Wang, Duojun</au><au>Karato, Shun-ichiro</au><au>Jiang, Zhenting</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>An experimental study of the influence of graphite on the electrical conductivity of olivine aggregates</atitle><jtitle>Geophysical research letters</jtitle><addtitle>Geophys. Res. Lett</addtitle><date>2013-05-28</date><risdate>2013</risdate><volume>40</volume><issue>10</issue><spage>2028</spage><epage>2032</epage><pages>2028-2032</pages><issn>0094-8276</issn><eissn>1944-8007</eissn><abstract>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.
Key Points
Graphite formed from diamond at high P,T has thin disk‐shape morphologyFor graphite to enhance conductivity depends on volume fraction and geometryHigher carbon content may explain the observed high conductivity in some regions</abstract><cop>Washington</cop><pub>Blackwell Publishing Ltd</pub><doi>10.1002/grl.50471</doi><tpages>5</tpages><oa>free_for_read</oa></addata></record> |
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| source | Wiley Journals; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; Wiley Free Content; Wiley-Blackwell AGU Digital Library |
| subjects | Aggregates Anisotropy Annealing Conductivity Crystallography Crystals Diamonds Electrical conductivity Electrical resistivity Genetic transformation Geometry Graphite High pressure Mathematical morphology Morphology Olivine Orientation Percolation percolation threshold Pressure Regions Resistivity Rocks Shape Temperature Temperature effects |
| title | An experimental study of the influence of graphite on the electrical conductivity of olivine aggregates |
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