Surface morphologies of anthracene single crystals grown from vapor phase |
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Authors: | Sadaharu Jo |
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Affiliation: | Department of Materials Science and Environmental Engineering, Tokyo University of Science, Yamaguchi, 1-1-1 Daigaku-Dori, Onoda, Yamaguchi 756-0884, Japan |
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Abstract: | The morphologies and lattice structures of anthracene single crystals grown from the vapor phase were investigated using optical microscopy, phase contrast microscopy, atomic force microscopy (AFM), and X-ray diffraction analysis. Common morphologies with hexagonal large planes were observed irrespective of crystal size. The observation of certain surface morphologies with a phase contrast microscopy revealed that the spiral steps originated from screw dislocations present on the (0 0 1) planes. Moreover, the center and edge of the (0 0 1) planes had large curvatures, similar to hills. Resultantly, quarter-monolayer (ML) steps were observed on the large and flat planes between both hills. |
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Keywords: | 61.72.Ff: Direct observation of dislocations and other defects (etch pits decoration electron microscopy X-ray topography, etc.) |
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