PTCR property in carbon-NaCl composites |
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| Authors: | M Miyayama J Teranishi H Yanagida |
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| Affiliation: | (1) Research Center for Advanced Science and Technology, University of Tokyo, 4-6-1 Komaba, Meguro-ku, 153 Tokyo, Japan;(2) Department of Industrial Chemistry, Faculty of Engineering, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, 113 Tokyo, Japan |
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| Abstract: | The composition dependence of resistivity and the positive temperature coefficient of resistivity (PTCR) were investigated in composites of electrically conducting carbon and insulating NaCl. Resistivity at 20 C of the composites decreased rapidly with increasing carbon volume fraction above a critical volume fraction, Vc, which was well expressed by an equation of the percolation theory. The value of Vc decreased from 25 vol% to 4 vol% when the particle size ratio of NaCl/carbon increased from 0.5 to 50. When the carbon volume fraction was close to the value of Vc, the composites showed pronounced PTCR properties with a resistivity increase of five orders of magnitude and a temperature coefficient of 15%–17% K–1. A composite of all inorganic materials with a controllable PTCR property is suggested to be possible. |
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