METHOD OF GROWING CRYSTALS OF SILVER AND THALLIUM HALIDES Russian patent published in 2013 - IPC C30B11/02 C30B29/12 

FIELD: chemistry.

SUBSTANCE: invention relates to production of materials which are transparent in the infrared region, and specifically crystals of silver and thallium halides, which can be used in making optical components transparent in the wavelength range from 0.4 mcm to 25 mcm, as well as in making infrared fibre light-emitting diodes. The method of growing crystals of silver and thallium halides involves loading material based on a solid solution of silver or thallium halides into a container made from heat-resistant glass, melting, filtering the melt through an opening in the container into a receiving ampoule and directed crystallisation of the melt by moving in a temperature gradient. Before filtering, the melt is cooled to a temperature which is 1-2 degrees lower than the melting point of the corresponding solid halide solution, held for 1.5-2.0 hours, followed by overheating the melt 40-50 degrees higher than the melting point of the solid solution, and filtering is carried out at a rate of 0.1-2.0 l/min.

EFFECT: reducing content of impurities in crystals in one growing process, which simplifies the process and enables to reduce absorption of laser radiation.

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