Based on conductivity, Hall effect, and magnetoresistance measurements an attempt is made to describe the behavior of current carriers in the layer planes of well-ordered pyrolytic graphite. The total carrier concentration decreases from approximately 11×{}10¹⁸ cm^-3 at room temperature to less than 4×{}10¹⁸ cm^-3 at very low temperatures, in good agreement with single-crystal results. The average mobility, which is strongly dependent upon the crystallite size, was found to exceed 3000 cm²/v-sec at liquid nitrogen temperature in specimens deposited at 2500^∘{}C; the mobility ratio (μₑμₕ) appears to remain temperature independent and equal to 1.08±{}0.01.
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Klein et al. (1961) studied this question.
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