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| Abstract |
Positron annihilation lifetime measurement has been performed for the HOPG (highly oriented pyrolytic graphite) irradiated with electrons at 77K. The positron lifetime for the unirradiated specimen wa...s 202 psec, and was decomposed into two components, i.e.156 psec (52.9%) and 244 psec (47.1%). By the electron irradiation the second lifetime increased to 278 psec (55.7%). Through the isochronal annealing up to 1000℃the second lifetime gradually increased to 335 psec, but the corresponding intensity decreased to 37.7%. Above l000℃the second lifetime once showed a decreasing tendency, but again increased to 347 psec at l600℃. This second increase in high temperature region might be due to the migration and the agglomeration of radiation-induced vacancies, but the first increase is not so clear, probably is related with the agglomeration of self-interstitial atoms.show more
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