FIELD: crystal growing. SUBSTANCE: method involves growing a source crystal from melt, and cooling it to room temperature in a growing device at the rate of 18-20 deg/h. The crystal is calcined in air, heating it at the rate not over 110 deg/h to 300-330 C and holding it at this temperature for 4-5 h. Then the crystals are cooled to room temperature at the rate of 30-35 deg/h. EFFECT: higher efficiency.
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