Abstract
FRANK1 predicted from theoretical considerations that crystal growth may proceed owing to the presence of screw dislocations. Spiral growth-steps confirming these ideas were observed by Griffin2 in beryl crystals and by Dawson and Vand3 in n-paraffin crystals. The dislocation responsible for the growth of a crystal may be described by means of a Burgers vector. For a simple screw dislocation, this vector is one structural unit in length and perpendicular to the growing face, so that a spiral growth-step one unit in height is generated. In a certain number of cases the Burgers vector is several units in length, the original length being determined by the detailed shape of the primary nucleus or other accidents of growth.
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References
Frank, F. C., Farad. Soc. Discuss., Crystal Growth, No. 5 (1949).
Griffin, L. J., Phil. Mag., 41, 196 (1950).
Dawaon, I. M., and Vand, V., Nature, 167, 476 (1951); Proc. Roy. Soc., A, 206, 555 (1951).
Frank, F. C., Phil. Mag., 42, 1014 (1951).
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VAND, V. Polymorphism arising from Screw Dislocation. Nature 168, 783 (1951). https://doi.org/10.1038/168783a0
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DOI: https://doi.org/10.1038/168783a0
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