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From Facets to Fractals - Growth Morphologies in Molecular Crystals of Carbon Tetrabromide (Cbr4) and Fullerene C60

Published online by Cambridge University Press:  03 September 2012

Rong-Fu Xiao
Rong-Fu Xiao*
Affiliation:
Department of Physics, The Hong Kong University of Science & Technology, Clear Water Bay, Kowloon, Hong Kong
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Abstract

We have experimentally studied the growth morphologies of carbon tetrabromide CBr4 and fullerene C60crystals in their orientationally disordered solid phases. Very rich growth morphologies have been observed from these crystals, ranging from facets to dendrites and to fractals. In the vapor growth of CBr4crystals, we found that the growth morphologies depend not only on temperature and supersaturation, but also sensitively on the total pressure of the inert gas in the growth chamber. With increasing total pressure, under otherwise the same growth conditions, crystals with initially smooth surfaces evolve into dendritic structures. For fullerene C60, the growth morphologies from solution are mainly fractals with strong anisotropy in the individual crystals. The growth morphologies from vapor are normally faceted and the growth proceeds via a layer-by-layer mode.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 367: Symposium P – Fractal Aspects of Materials , 1994 , 61
Copyright
Copyright © Materials Research Society 1995

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