FIELD: monocrystals production. SUBSTANCE: invention is designed for application when manufacturing devices utilizing bulk acoustic waves and is distinguished by carrying out heat treatment at temperature within the range of 1300-1673K in argon atmosphere at pressure 1.1-1.8 atm for 20-36 h. EFFECT: enabled preparing monocrystals no less than 2 mm in diameter with weight larger than three and half kg, free of mechanical strains and scattering sites. 1 dwg
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