Growth of the tetrahedral faces of sodium chlorate crystals in the presence of dithionate impurity

Add time:07/19/2019    Source:sciencedirect.com

It has been established that trace amounts of S2O2-6 anions initiate the appearance of new faces, {111}, on sodium chlorate crystals grown from aqueous solution. The present study compares the growth mechanisms of the {111} habit faces and {111} type faces using laser interferometry techniques. The {111} faces show dislocation layer growth in which the impurity influences the growth by causing the gradual deceleration of step movement. In contrast, the {111} faces incorporate crystal units into an atomically rough surface. Under these circumstances the impurity on the surface creates a barrier to continuous growth. The strong impurity interaction with the {111} faces can be explained by the close structural similarity of the -SO3 portion of the S2O2-6 ions to the ClO-3 ions situated on these faces. This allows the dithionate ion to substitute for ClO-3, disturbing the structure and energy of the interface and inhibiting growth.

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