NIOBIUM-SUBSTITUTED SODIUM-ZIRCONIUM MOLYBDATE AND METHOD FOR PRODUCTION THEREOF Russian patent published in 2024 - IPC C01G39/00 C01G25/00 C01G33/00 C01D13/00 

FIELD: chemistry.

SUBSTANCE: invention relates to chemical engineering. Preparing a solution containing niobium oxide Nb₂O₅, previously dissolved in ammonia NH₄OH at rate of 1 ml of NH₄OH per 6.0–7.0 mg of Nb₂O₅ at temperature of 60–70 °C. 7.6–7.9 ml of 10% alkali NaOH in terms of Na⁺ in accordance with the stoichiometry of the end product — Na_4-xZr(Mo_1-xNb_xO_4-x)₄, where x=0.0125; 0.025; 0.05. Then glucose C₆H₁₂O₆ is added, in the following ratio, mol.: Nb₂O₅:C₆H₁₂O₆ = 1:7. Solution of zirconium hydroxocarbonate pentahydrate Zr(OH)₂CO₃∙5H₂O is prepared separately in concentrated nitric acid HNO₃ at temperature of 50–60 °C. Both solutions are mixed. Ammonium 4-aqueous hexamolybdate (NH₄)₆[Mo₇O₂₄]^.4H₂O is added to the mixed solution, pre-dissolved at temperature of 50–60 °C in distilled water, in molar ratio: Zr(OH)₂CO₃^.5H₂O:(NH₄)₆Mo₇O₂₄]^.4H₂O:Nb₂O₅=1:(0.56÷0.54):(0.25÷0.1). Obtained mixture is held at 70–80 °C to obtain a dry residue, which is calcined in two steps with intermediate grinding and briquetting: I stage — at 300–350 °C for 3–3.5 hours; II stage — at 430–440 °C for 6–7 hours.

EFFECT: obtaining a new chemical compound — niobium-substituted sodium-zirconium molybdate with composition Na_4-xZr(Mo_1-xNb_xO_4-x)₄, where x=0,0125; 0,025; 0,05, which enables to expand the range of materials used as crystalline matrices of optical or quantum generators.

2 cl, 2 dwg, 3 ex