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Conductivity and resistivity of carbon materials
Views: 629 Update date: Jun 06,2020

The conductivity of various carbon materials is different. The conductivity of carbon materials with high graphitization degree has obvious anisotropy. If the graphite degree is high, the layer arrangement is close to parallel, and the crystal defects are few, which is conducive to free electron flow, then the resistivity is low.


The electrical conductivity of carbon materials is restricted by two factors: on the one hand, when the graphite crystal is heated, the electrons on the valence band excite and transition to the conduction band, and the number of free electrons becomes more, the resistivity decreases; on the other hand, when the temperature increases, the thermal vibration of lattice lattice increases, the amplitude increases, the flow resistance of free electrons increases, and the resistivity increases. Therefore, when the temperature makes the electron excitation play a leading role, the temperature coefficient of carbon material's resistance is negative, while when the lattice thermal vibration plays a leading role, the temperature coefficient of resistance is positive. The temperature coefficient of graphite resistance is negative when it is 100-900k, and positive when it is above 900K. According to the temperature coefficient of resistance, the resistivity of graphite at a certain temperature can be calculated.

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