METHOD OF PRODUCING NANOSTRUCTURED POWDERS OF SOLID SOLUTIONS BASED ON YTTRIUM-ALUMINUM GARNET WITH RARE-EARTH ELEMENT OXIDES Russian patent published in 2019 - IPC C30B29/28 C04B35/44 C04B35/50 C04B35/626 B22F9/04 B22F9/24 C01F1/00 C01F17/00 C01F7/02 H01S3/16 G02B1/02 B82B3/00 B82Y40/00 

FIELD: technological processes.

SUBSTANCE: invention relates to production of nanostructured powders of solid solutions based on yttrium-aluminum garnet, alloyed with rare-earth elements for production of ceramics, used as an active medium of a solid-state laser, heat-resistant high-temperature electric insulating material, windows or lenses in optical instruments, optical elements in the infrared region of the spectrum. Method of producing nanostructured powders of solid solutions based on yttrium-aluminum garnet with rare-earth elements involves preparation of a mother solution, evaporation to a concentrated state, combined coprecipitation through coprecipitation of the mother solution with subsequent filtration of the precipitated precursor powder, decantation, drying, and heat treatment at 1,000 °C, wherein the mother solution of nitrate salts of yttrium, aluminum and nitrate salts of rare-earth elements Er, Tm, Ho or their compositions Er-Tm; Er-No; Er-Tm-No within 1.0–50.0 at% is dissolved in distilled water while heating and evaporated to concentration of 0.88÷0.92 mol/l, is sprayed in 25 % ammonium hydroxide solution cooled to temperature of 0 °C–2 °C compressed air through capillary with providing crushing of jet of saturated mother solution to fog-like condition to produce precursor powder Y_3-XMe_XAl₅O₈(OH)₄, where Me=Er, Tm, Ho, x=1.5; 0.05; 0.01, respectively, the pulp is decanted in distilled water with addition of 0.05 wt% polyvinylpyrrolidone from the amount of the ammonium hydroxyl solution to form interlayers preventing hydration and combining the particles into dense agglomerates, filtering, powders are dried by hot air at 60 °C–100 °C on spray drier and subjected to mechanical activation in vibration or planetary type mill in fluoroplastic drums with zirconium balls with diameter of 1.0 mm for 120 minutes in ethanol medium at ratio of precursor powder to total amount of zirconium balls and ethanol equal to 1:6.5; ethanol is removed by drying the suspension to obtain granules on the spray dryer.

EFFECT: method enables single-step production of nanostructured powders with high homogeneous distribution of rare-earth elements in the volume of crystallites of the powder, particle size of 40–65 nm, dispersity of specific surface area of more than 120 m²/g, as a result of which ceramics is produced from these powders with high light transmission and optical homogeneity.

1 cl, 3 dwg, 1 tbl, 5 ex