XCIII. The growth of crystals of the hexagonal metals from their vapours

Abstract

The techniques for preparation of well-developed growth surfaces of crystals of the hexagonal metals are described. A subsequent examination of the surfaces under the phase contrast microscope reveals growth steps which are probably monomolecular. Spiral growth hills on basal surfaces of magnesium and cadmium crystals indicate that these grow by the screw dislocation mechanism. The growth patterns on basal surfaces of zinc can only be explained by a spreading of (0001) monolayers, which are catalyzed by a foreign nucleus, probably zinc oxide. Similar nuclei incorporated in zinc crystals during growth are revealed by evaporation from the habit faces. The possibilities of performing plastic deformation experiments with these crystals are discussed.