METHOD OF GROWING BULK CHRYSOBERYL MONOCRYSTALS AND VARIETIES THEREOF Russian patent published in 2008 - IPC C30B15/02 C30B9/12 C30B27/02 C30B29/22 

FIELD: crystal growing.

SUBSTANCE: invention relates to preparation of chrysoberyl monocrystals and its varieties, including alexandrite - chromium-containing variety, which can be used for manufacturing high-quality faceting material in jewelry industry and for manufacturing quantum electronics elements. Growing of bulk chrysoberyl monocrystals and its varieties comprises melting starting blend, homogenizing melt, adding rotating monocrystalline seed, and growing crystal at temperature below phase transfer temperature. Starting blend contains elevated stoichiometric amount of one of its components, namely beryllium oxide by 3-6% or aluminum oxide by 5-6%, with corresponding reduction of content of other constituent. Growing of crystal is conducted under temperature lowering regime at a rate of 0.5-4°C/h, including lowering temperature below eutectic temperature. Starting blend may contain B³⁺ or Si⁴⁺ cations in the form of corresponding oxides in amount of 0.3-0.5%.

EFFECT: enabled growing of defectless chrysoberyl monocrystals at high mass growth rate.

2 cl, 1 dwg, 2 ex