Abstract
Hydrogen retention in graphites and CFCs (carbon fiber/carbon composites) has been studied with the crystallographic data obtained by the X-ray diffraction (XRD) technique. The amounts of retained hydrogen vary substantially among the samples by a factor of up to 16. After neutron irradiation at 1.9 × 10 24 n/m 2(∼ 0.2 dpa), the hydrogen retained becomes 20–50 times a larger than that of unirradiated samples. A strong correlation is observed between the values of hydrogen retention and the lattice constant c 0. The size of crystallite also has a good correlation with the hydrogen retention. Hydrogen atoms will be trapped at dangling carbon bonds at edge surfaces of crystallite which are thermally stable even at high temperatures above 1000°C. Differences among the desorbed amount of hydrogen gas from graphite materials can be also explained well by this model.
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