Abstract
Summary The present paper gives a more detailed account of the observation of growth spirals on (111) faces of gold crystals, obtained by precipitation. The observations prove that Frank's theory also holds for metal crystals; moreover they constitute the first visual proof for the presence in metal crystals of dislocations in general, and screw dislocations in particular. They further show that the Burgers vector of dislocations in metals is not necessarily limited to one unit of a few simple lattice displacements, as is generally assumed. The shape of the growth spirals is briefly discussed.
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