SINGLE-PHASE POLYCRYSTALLINE YTTRIUM-ALUMINUM GARNET, ACTIVATED WITH ERBIUM, YTTERBIUM, AND A METHOD FOR PRODUCTION THEREOF Russian patent published in 2019 - IPC C04B35/44 C04B35/50 C04B35/626 

FIELD: manufacturing technology.

SUBSTANCE: invention relates to production of ceramics based on yttrium-aluminum garnet (YAG), activated with rare earth elements: erbium or ytterbium, used as substrates for microcircuits, shells of sodium lamps of high pressure, for insulators in thermionic converters and in optoelectronics. Method of producing material involves synthesis of hydroxides of yttrium, scandium, aluminum and erbium or ytterbium by co-precipitation of salts YCl₃*6H₂0, AlCl₃*6H₂O and ErCl₃⋅6H₂O or YbCl₃*6H₂O in stoichiometric ratio with addition of scandium chloride in amount of 20 mol% over stoichiometry; milling and calcination at temperature 1,200–1,250 °C; synthesis of compensating additive Al(OH)₃; combined grinding of hydroxides and compensating additive in planetary mill; sieving; formation of compact with subsequent sintering and annealing in air. Compensating additive in form of submicron powder of aluminum hydroxide with particle size of less than 1 micron, in amount of 5 to 10 wt% at the powder grinding step in the planetary mill is introduced based on X-ray phase analysis data and inductively coupled plasma mass spectrometry (ICP-MS analysis).

EFFECT: invention results in production of stable single-phase material having high operational characteristics: light transmission, heat resistance, heat conductivity, dielectric permeability and strength.

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