Abstract
The diffuse X-ray maxima exhibited by single crystal diamonds, which had undergone a density decrease of about 6% on fast neutron irradiation, lay closer to the Bragg positions of the irradiated crystals than those of the unirradiated crystals. Annealing resulted in shift of both the diffuse maxima and the Bragg positions. Diamonds in which the macroscopic density decrease on irradiation was less than about 12% recovered towards the original single crystal form on annealing. However, diamonds in which the density decrease on irradiation was more than about 12% reverted towards a semi-amorphous state, the density of which was about half that of unirradiated diamond, on annealing at temperatures below that required to produce significant graphitization in unirradiated diamond. Type I X-ray behaviour was observed after annealing diamonds which had undergone density decreases on irradiation of up to 9%.
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