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.
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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