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Journal of Electron Microscopy 48(5): 519-523 (1999)
© 1999 Oxford University Press

Fragmentation of graphite crystals by electron irradiation at elevated temperatures

Shunsuke Muto* and Tetsuo Tanabe

Center for Integrated Research in Science and Engineering (CIRSE), Nagoya University Chikusa-ku, Nagoya 464-8603, Japan

*To whom correspondence should be addressed. E-mail: muto{at}cirse.nagoya-u.ac.jp

The structural change in electron-irradiated graphite was examined at elevated temperatures by means of TEM, HREM and ELNES. Above ~650 K irradiation the electron diffraction patterns gradually turned into sharp Debye-Scherrer rings, in contrast with the formation of diffuse halo rings at lower temperature irradiation (<600 K). HREM images and ELNES spectra from the area irradiated at 680 K indicated that the resultant structure was simply polycrystallized graphite which was constructed by fragmented graphite crystallites, a few nanometers in size, with the hexagonal network rigorously maintained. This structure significantly differs from that observed in the previous reports below 600 K which incorporates the formation of non-hexagonal atomic rings.

Keywords     graphite, HREM, ELNES, electron irradiation, polycrystallization, displacement damage

Received     16 October 1999, accepted 5 April 1999


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