PLURALITY OF SAPPHIRE SINGLE CRYSTALS AND PRODUCTION METHOD FOR SAME

摘要

[Problem] To provide a plurality of sapphire single crystals for which excellent mass-productivity is achieved by controlling variations in the spreading speeds of different sapphire single crystals during multi-growth of sapphire single crystals. Also to provide a production method for the plurality of sapphire single crystals. [Solution] By optimizing the balance between a temperature gradient along the direction in which dies are aligned and a temperature gradient along the long direction of the dies, the present invention controls variations in spreading speed and sets a start point for a transition toward a straight body part of a sapphire single crystal at a value that is within a prescribed range that corresponds to the width of the straight body part.