LOW TEMPERATURE THERMAL AND ELECTRICAL CONDUCTIVITY AND THERMOELECTRIC POWER OF GRAPHITE

摘要

The thermal and electrical conductivity and the thermoelectric power of anatural graphite and several artificial graphite types have been measured from near the liquid-helium point to room temperature. The thermal conductivity was measured by a "self-heating" (Kohlrausch) method which permitted the use of small sarnples. The thermal conductivity was found to vary as the 2.7 power of the temperature in the low-temperature region. There appeared to be no correlation between the particle size and the temperature dependence in the low temperature region, but there was evidence for a smaller dependence on tem perature with a decrease in the degree of graphitization. The thermoelectric power at a given temperature was found to increase with a decrease in particle size.