Abstract
Radiation swelling (change of the unit-cell parameters) of reactor graphite and diamond is measured as a function of the perfection of the crystal lattice. The initial powders are irradiated together with powders which have been exposed to an explosive wave with nominal pressure ∼40 GPa. Such treatment results in up to 100% broadening of the diffraction lines. In addition, ultrasmall-grain diamond is used. Irradiation is conducted in a BOR-60 reactor up to fluence 1·1022 cm−2 at 390 and 475°C. The investigation shows that the distortion of the crystal lattice and change in the size of crystallites can decrease by factors of 1.6–5 the growth of the unit-cell parameters of graphite and diamond.
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