Topographical studies of cleaved anthraquinone crystals provide evidence for twinning on (20¯1) in accordance with the predictions of the sense of angle (SA) mechanism. Supplementary studies on etched, as-grown and cleaved crystals of anthraquinone and p-terphenyl, and a comparison of the results with the available data on anthracene, reveal that the dislocation arrangements in the three isostructural solids can be interpreted in terms of the relative dimensions of the unit cells. In anthraquinone, the (100)  slip system is found to be of greater significance than the (001)  system, which is dominant in anthracene, whereas the near orthorhombic nature of the p-terphenyl structure results in slip being favoured on (1¯10). Twinning and glide are common to (20¯1) of anthraquinone, whereas glide alone has been observed on (20¯1) of anthracene and (201) of p-terphenyl. Possible partial dislocations and associated stacking faults are discussed.
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Williams, J.O., Adams, I. & Thomas, J.M. The relationship between dislocations and molecular structure in aromatic crystals. J Mater Sci 4, 1064–1068 (1969). https://doi.org/10.1007/BF00549845
- Molecular Structure
- Slip System