Crystals of icosahedral C60/C70 clusters have been studied using electron diffraction and high-resolution electron microscopy. The as-grown crystals are found to be hexagonally close packed but with a lot of stacking defects. Under electron irradiation they transform into a face-centred cubic structure. Evidence is provided for a close mixture of C60 and C70.
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Tendeloo et al. (1991) studied this question.
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