Evidence for vacancy migration at 220 k in iron, given by high voltage electron microscopy
- 1 January 1982
- journal article
- research article
- Published by Taylor & Francis in Radiation Effects
- Vol. 61 (1), 99-108
- https://doi.org/10.1080/00337578208225738
Abstract
The growth of interstitial loops has been studied by 1 MeV electron microscopy in pure iron samples, irradiated and observed between 180 K and 800 K. It is shown that, below 220 K, the increase of the interstitial loop diameter obeys a tn law, with nt being the observation time). Above 220 K, a linear t law is observed. Moreover, the evolution of the loop density is strongly modified below and above 220 K. Both results lead to the conclusion that vacancies migrate at 220 K in iron. The discrepancy with previous results obtained by other physicists is explained by a model in which mobile vacancies interact with residual impurities.Keywords
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