Atomic force microscopy and x-ray diffractometry were used to study 1500 Å-thick films of pure C60 grown by sublimation in ultrahigh vacuum onto a CaF2 (111) substrate. Topographs of the films did not reveal the expected close-packed structures, but they showed instead large regions that correspond to a face-centered cubic (311) surface and distortions of this surface. The open (311) structure may have a relatively low free energy because the low packing density contributes to a high entropy of the exposed surface.
|Original language||English (US)|
|Number of pages||3|
|State||Published - 1991|
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