The annealing of thermal conductivity changes in electron-irradiated graphite

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Abstract
Specimens of pure pile graphite have been irradiated with electrons in liquid nitrogen, and the annealing of the resultant thermal and electrical resistivity increases has been studied. An anomalous increase in thermal resistivity has been found between 220°K and 280°K. The effect increases rapidly with the dose, and is ascribed to the formation of small complexes of interstitial atoms. Comparison with other recent low temperature work in graphite suggests a simple model of the behaviour of Frenkel defects.