Stage III recovery of electron-irradiated high-purity molybdenum

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Abstract
The resistivity recovery above room temperature has been studied on extremely high-purity molybdenum following 1.7 MeV electron irradiation near 5 K. Stage III appears at around 450-700 K with a shoulder on the low-temperature side. The peak temperature of stage III decreases with increasing irradiation dose. The obtained activation energy for the main recovery process is .1.30 ±0.02 eV, which is in good agreement with values obtained in former experiments by cold work, neutron irradiation and electron irradiation. A comparison of the present results with those of former experiments shows that the centre temperature of stage III depends, besides the defect concentration, sensitively on the purity of the specimens, and on the nature of the damage. An example of a cold-worked high-purity specimen is also presented. The above-mentioned findings were observed earlier and are reproduced here on a specimen of extreme purity. It is suggested that the creation of different sink structures for the mobile stage III defect is reponsible for this phenomenon.