METHOD OF PRODUCING BISMUTH, IRON AND TUNGSTEN OXIDE POWDER WITH PYROCHLORE PHASE STRUCTURE Russian patent published in 2024 - IPC C01G41/00 C01G29/00 C01G49/00 B22F9/24 C30B29/32 B01J23/30 B01J23/31 B01J23/745 B01J23/76 B82Y30/00 B82Y40/00 

FIELD: chemistry.

SUBSTANCE: invention relates to methods of producing nanosized and/or submicron powders of complex oxide of bismuth, iron and tungsten, which can be used in technologies for obtaining materials for photocatalytic processes of oxidation of harmful organic substances, in photocatalytic processes of generating hydrogen for the needs of hydrogen power engineering, as well as materials of conducting layers in solar cells. Composite composition (Bi₂O₃)_0.61(Fe₂O₃)_0.22(WO₃), which is a mixture of pyrochlore of composition (Bi₂O₃)_0.52(Fe₂O₃)_0.27(WO₃) and Aurivillius phases Bi₂WO₆, are prepared from solutions of bismuth nitrate, iron nitrate and ammonium paratungstate, taken in stoichiometric ratio, by mixing them to form a suspension. Obtained precursor suspension is evaporated until complete evaporation of the liquid. Obtained precursor powder is heated to temperature of 280–300 °C at rate of 5–10 °C/min and held at this temperature for at least 1 hour, then heated to temperature of 580–600 °C at rate of 10–15 °C/min and held at this temperature for 4–5 hours. Obtained powder is cooled.

EFFECT: invention simplifies the process of producing nanocrystalline particles of a given stoichiometry and smaller dimensions of the powder product (Bi₂O₃)_0.61(Fe₂O₃)_0.22(WO₃) and improve environmental friendliness of synthesis technology.

1 cl, 8 dwg, 2 tbl, 3 ex