Abstract

It is shown that Verneuil’s method can yield crystals of constant cross section with specified growth parameters if the radius is less than the capillary constant. A stability analysis defines the optimal growth conditions for large crystals together with the control laws for the charge consumption in growing large crystals of given cross section in an automated process. A stability analysis is also made for growing tubes by Verneuil’s method. The process is stable if the wall thickness is less than the capillary constant. Single-crystal corundum tubes of constant cross section have been made with specified growth parameters.

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