| 摘要 |
A method comprises melting original material, extension for rotating seeding agent, growth of cone part of crystal, extension of cylindrical part thereof, separation of crystal from the melt is carried out by increasing rate of extension to 100-200 mm/min. with subsequent cooling at a rate of 100-150 degrees /hour. Before separation at first power of heating is increased by 2-3 % at 2-5 s, kept for 3-7 minutes, then the heating power is reduced by 7-15 % at 2-5 s, then after 5-10 s the rate of rotation is reduced to 12-15 rotations/min, thereafter separation of crystal is carried out, and before cooling it is kept above melt at unchanged power during 20-30 minutes.
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