c-Axis Spacing Changes in Pyrolytic Graphite after Neutron Irradiation at 5 K

概要

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Change in the c-axis spacing in pyrolytic graphite after fast neutron irradiation at 5 K and subsequent isochronal pulse annealings have been measured in the range of 5∼900 K by X-ray diffraction method. The c-axis expansion was estimated to be Δc_0/c_0=3.4N_i, where N_i is the fractional concentration of interstitial atoms. This corresponds to a volume change of 3.3 atomic volume per interstitial atom. For annealings of the c-axis spacing, a small recovery below 80 K was followed by a large recovery at around 100 K, and above it a small continuous recovery occurred up to 900 K. The large recovery at around 100 K was interpreted by the formation of C_2 molecules and interstitial clusters. The present results were discussed comparing with the so far reported results of electrical resistivity, thermal resistivity and stored energy release measurements.
社団法人日本物理学会の論文
1975-12-15