Abstract
Methylene blue and ammonium iodide crystals grow epitaxially on a mica cleavage surface, the orientation of the deposit crystals being determined by the substrate surface structure. Thus the orientation of a crystal growing from a nucleus formed on one side of a cleavage step may differ from that of a crystal seeded on the other side. Despite this, a growing crystal retains its original orientation on and after crossing such a step; growth is then no longer epitaxial. When sodium nitrate crystals growing epitaxially on a calcite cleavage surface are mechanically disordered, the crystals continue to grow in their deranged orientations uninfluenced by the substrate surface structure. It is concluded that in epitaxial crystal growth the substrate only determines the orientation of the first few atoms and that the further growth of this nucleus is no longer influenced by the substrate surface structure.
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