Observation of Spatial Correlation between Growth Spirals and Inclusions in Stearic Acid Crystals Grown from Solution

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Abstract
Optical microscopic observation was made on the {001} surfaces of solution-grown stearic acid crystals to study the spatial correlation between some of the centers of growth spiral steps, which were detected optically, and the terminal ends of the inclusions of mother liquid. An etching experiment showed that the dislocation lines at the growth spiral centers terminated at the terminal ends of the inclusions and it was confirmed that such inclusions changed to hollow tubes by the application of the external stresses. The experiments suggested that a group of screw dislocations would be originated from the terminal ends of special kinds of inclusions formed during growth under relatively high supersaturation. A model taking the overhanging over macrosteps and subsequent slight bending of lateral growth steps moving on the {001} surfaces into consideration is proposed to explain the experimental results.

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