Abstract
A device to selectively introduce gases into a melt of KCl from which single crystals or oriented bicrystals are being pulled is described. The insoluble gases (e.g. Ar, Cl2, N2, and CO2) were incorporated into the growing crystals in the form of bulk and grain boundary bubbles having a decided crystallographic appearance. The as‐grown bubbles of Ar and Cl2 were extended along the growth axis, whereas those of N2 and CO2 were compressed in this direction. The bubble shapes are expected to depend on surface energy considerations and on the way in which the gas interacts with the solid; the bubble geometries were qualitatively consistent with available data on the theoretical adsorption behavior of these gases on (100) crystal faces of KCl. On annealing under load, the bubbles became highly faceted. Only the very stable (100) plane developed; this indicates the extreme anisotropy of the surface energy even at temperatures approaching the melting point. The failure of bubbles to evolve completely into cubes is probably due to the difficulty of establishing growth habits normal to the (100) plane.
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