METHOD OF PRODUCING OPTICAL NANOCERAMICS BASED ON SOLID SOLUTIONS OF THE SYSTEM TlBrI - AgClBr (VERSIONS) Russian patent published in 2024 - IPC C04B35/515 G02B6/02 B82Y30/00 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing a new element base based on solid solutions of silver and thallium (I) halides for the terahertz and infrared regions, specifically to optical nanoceramics, which can be used in optics and photonics, laser physics, nonlinear and infrared fibre optics in infrared and terahertz regions. Method of producing optical nanoceramics involves preliminary preparation of a mixture by a hydrochemical basic method of thermal-zone crystallization-synthesis by dissolving until saturation at temperature of 100 °C of solid solution TlBr_0.46I_0.54 and solid solution AgCl_0.25Br_0.75 in aqueous solutions of 3M hydrochloric acid, followed by crystallisation from it at temperature of 60 °C rhombic and cubic phases. Rhombic phase has the composition Tl_3–xAg_xCl_0.25xBr_1.38+0.29xI_1.62–0.54x, and the cubic phase is formed on the basis of a solid solution of the composition TlBr_0.46I_0.54 of the structural type CsCl and a solid solution of the composition AgCl_0.25Br_0.75 of the structural type NaCl. Then, mixture is dried and melted in ampoule with capillary hole in conical bottom, thereafter, the melt is instilled into the growth ampoule to remove carbon- and oxygen-containing impurities when the ampoule is moved to the lower zone of the apparatus. Obtained nanoceramic block is annealed and articles are cut from it.

EFFECT: obtaining highly transparent nanoceramics up to 76–78 % in the visible and infrared ranges from 0_47 to 65 mcm depending on the chemical composition, as well as in the terahertz range from 4_6 to 30 THz (65–10 mcm); nanoceramics has a refraction index of 2_1–2_2, is non-hygroscopic, plastic, resistant to UV and ionizing radiation.

3 cl, 8 ex, 2 dwg