Structure and growth phenomena of C₆₀ and C₇₀ single crystals

Abstract

C₆₀ and C₇₀ single crystals free from solvent contamination grew from their vapour. Large C₆₀ crystals up to a size of about 5 mm×3 mm×3 mm and C₇₀ crystals about 1 mm×1 mm×1 mm were obtained. C₆₀ crystals with fcc structure showed two types of morphological faces, namely {111} and {100}, frequently with twinning on {111} face. C₇₀ crystals obtained have a hcp structure witha=10.1 Å andc=16.7 Å. DSC and X-ray diffraction analysis indicated that C₇₀ crystal underwent phase transition below 100 C. Morphological observation suggests that the growth of C₆₀ and C₇₀ single crystals is based on layer-spreading mechanism.

Keywords

C₆₀ / C₇₀ / single crystals / morphology

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