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Graphite formed by cracking methane under various conditions has been exposed to neutron irradiation. Changes in electronic properties were measured: (i) after radiation damage by neutron doses of the order 10 17 neutrons/cm 2 , (ii) after `mild' annealing around 470 °C, and (iii) after `strong' annealing at 2200 °C and above. Effects of radiation damage are proportionately greatest in specimens whose properties are initially nearest to those of ideal graphite. Some discrimination can be made between the types of disorder originally present, and the disorder added by irradiation. Changes of thermoelectric power of graphite in the direction of the c axis show `latent' increases attributed to disorder frozen in until after mild annealing.
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Blackman et al. (1961) studied this question.
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