Abstract
A crystal growth technique is described in which a tubular, annular, or ribbon-shaped capillary orifice is used to maintain the liquid level constant during growth and to determine the shape of the growing crystal. The orifice material must be wetted by, but chemically nonreactive to the molten phase of the crystal to be grown. Using molybdenum orifices and crucibles, single crystal sapphire filaments several hundred feet in length and diameters of .01 - .05 cm have been grown at speeds of 2.5 - 5 cm/min; c-axis crystals have been grown at rates up to 20 cm/min, and a variety of other crystal orientations has been grown at speeds up to 2.5 cm/min. Sapphire tubes, ribbons and multiple filaments have also been grown.
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