The effect of oxygen on “Stage III” annealing in neutron-irradiated niobium has been investigated by means of internal-friction and electrical-resistivity techniques. The oxygen Snoek peak decreased during isothermal annealing at 150°C and the kinetics of this process was similar to that of the electrical-resistivity decrease at the same temperature. Oxygen-free samples exhibited no annealing effects in Stage III. It was concluded that Stage III is caused by the migration of oxygen to radiation-produced defects.
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