METHOD OF SYNTHESIS OF COMPLEX OXIDE OF FORMULA YBeSiO Russian patent published in 2002 - IPC

FIELD: inorganic chemistry, chemical technology. SUBSTANCE: invention relates to a novel method of synthesis of complex oxide of the composition Y₂Be₂SiO₇ that can be used as crystalline medium for laser crystals. Crystals are grown by Tchokchralsky method on the growth device "Kristall-3". The parent oxides are taken in the following ratio, wt.%: yttrium oxide, 67.22-76.21; silicon oxide, 12.98-17.89; beryllium oxide up to 100. Oxides are mixed, a mixture is pressed to make tablets followed by their squeezing out at temperature 1195-1205 C for 19-20 h and then loaded in a crucible to grown crystals. Growing atmosphere: nitrogen/oxygen in relative volume concentration = 98:2; iridium crucible of size 40 x 2 x 40; temperature on melt surface is 1650 C; seed crystal is an iridium rod; elongation rate is 1.5-3 mm/h; plunger rate rotation is 10 rev/min; heat insulation of growing chamber is ceramics Al₂O₃,ZrO₂. Large size crystals are obtained (diameter is 15 mm, length is 30 mm) of good optical quality. EFFECT: improved method of production.