Über den Einfluß der Übersättigung auf das Wachstum von KCl-Einkristallen in reinen wässerigen Lösungen*

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Abstract
Artificially grounded spheres of KCl single crystals (15 mm diameter) were subjected to growth at 45°C and at sufficient controlled supersaturations in otherwise pure aqueous solutions. Even a very slight increase of the supersaturation about more than 0.07 percent shows a change of the habit from a cube to an octahedron. This change is interpreted by different mechanisms of growth of the fundamental different relief of the two types of the faces: {111} faces are always distinctly rough and consist of cubic “subindividuals” with edges of about 5 to 10 μ m. {100} faces are always smooth and transparent. The increase of the supersaturation thus found to be favouring different growth velocities in different directions. The growth processes of KCl show much more differences compared to NaCl than other physical properties do (distinct anisotropy of growth behaviour). The growth velocities of {100}, {111} and {110} – other faces do not occur – sometimes differ more than by the factor of 10 to 100.

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