APPARATUS FOR GROWING PROFILED SINGLE CRYSTALS OF HIGH MELTING TRANSPARENT METAL COMPOUNDS

摘要

PCT No. PCT/SU87/00117 Sec. 371 Date Jul. 26, 1988 Sec. 102(e) Date Jul. 26, 1988 PCT Filed Oct. 23, 1987 PCT Pub. No. WO88/03967 PCT Pub. Date Jun. 2, 1988.A process for growing shaped single crystals of refractory optically transparent metal compounds comprising melting a starting stock in an inert gas atmosphere under the effect of heat evolved by a heater; the melt is continuously fed into a crystallization zone through a capillary system of a shaping unit, followed by pulling a single crystal from the crystallization zone and cooling thereof. Prior to melting of the starting stock one control particle thereof is placed into the crystallization zone and at the moment of melting of said particle the heater power P is recorded. Melting of the starting stock is conducted at a heater power of (1.04-1.1)P, fusing of the seed-at a power of (1.03-1.08)P, building-up of the single crystal-at a power of (1.02-1.08)P; pulling-at a power of (1.02-1.22)P.