FIELD: crystal growth. SUBSTANCE: crystals are synthesized from blend having nonstoichiometric constitution CuxAlSey where x = 1.04-1.08 and y = 2.02-2.04 with subsequent directed crystallization by means of displacing pyrolytic boron nitride crucible with velocity not exceeding 0.3 mm/s in a vertical oven with temperature in the melting zone 1368-1448 K and temperature gradient on the crystallization front 60-120 K under selenium vapor pressure 2-5 atm. EFFECT: increased size, optical heterogeneity, and stability in air.
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