Figure 12
Growth of cubic and platelet crystals. The edge lengths of the crystals are a = b and c. No arrows are shown for needle morphologies c > a because these morphologies are unstable. Arrows show gradient flow directions for two cases. (a) η > −1, showing the usual case of either growth into macroscopic crystals with morphologies determined by the point group of the crystal, in this case cubes or dissolution. (b) η < −1. In this case, whereas large nuclei grow into macroscopic cubes as before, small nuclei grow into platelets. |