Samples of pure artificial graphite have been irradiated with electrons at 79°k, and a study made of the annealing characteristics of the changes in electrical conductivity, Hall effect and magneto-resistance. All three quantities show an anomalous annealing range below 120°k, and a simplified band theory calculation indicates that the concentration of both electrons and positive holes increase during irradiation and also in the anomalous annealing range.
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Reynolds et al. (1960) studied this question.
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