METHOD OF GROWING BULK MONOCRYSTALS OF ALEXANDRITE Russian patent published in 2013 - IPC C30B15/02 C30B9/12 C30B27/02 C30B29/22 

FIELD: chemistry.

SUBSTANCE: method involves dissolving the starting mixture, homogenisation thereof, placing a revolving single-crystal seed into the solution and growing a crystal, wherein the starting mixture contains 40 wt % beryllium aluminate with a chromium oxide additive in amount of 1-60 wt % of a solvent which consists of 95-98 wt % lead oxide and 2-5 wt % boron oxide, and the crystal is grown at temperature of 1250°C, axial temperature gradient of 2-20°C, drawing rate of up to 5 mm/day and rotational speed of up to 10 rpm.

EFFECT: obtaining bulk monocrystals of alexandrite of optical quality with low dislocation density.

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