METHOD FOR PRODUCING NANOCRYSTALLINE EPSILON PHASE OF IRON OXIDE Russian patent published in 2021 - IPC C01G49/06 C30B30/02 C30B29/16 B82B3/00 B82Y40/00 

FIELD: materials science and nanotechnology.

SUBSTANCE: invention relates to the field of materials science and nanotechnology, namely to the production of nanocrystalline epsilon-phase of the oxide Fe₂O₃, which can be used in hydrogen energy and magnetic recording media. The method includes the generation of four successive pulses of an iron-containing electric-discharge plasma into the main chamber 26, previously evacuated and filled with oxygen at normal atmospheric pressure and room temperature, using a coaxial magnetoplasma accelerator with a steel barrel 1 and with a composite central electrode made of a tip 2 made of steel and a shank 3 made of steel, with an electrically fusible jumper 4 made of graphite, placed between the steel barrel 1 and tip 2, in this case, the generation of each next plasma pulse is carried out after 700 mcs, using alternately the charge of one of four capacitor banks 17, 19, 21, 23 with a capacity of 7.2 mF each at a charging voltage of 3.0 kV, the nanocrystalline component of the synthesized product is moved into the buffer pre-evacuated chamber 37, opening the bypass valve 38 between the chambers 10 s after the last pulse of electric discharge plasma generation. The resulting product is collected from the inner walls of the buffer chamber 37, while generating pulses of iron-containing electric-discharge plasma into the atmosphere of the main heat-insulated chamber 26, pre-cooled to a temperature of 0 to -25°C, maintaining this temperature for the time required to obtain the product.

EFFECT: obtaining products with a nanocrystalline epsilon phase of iron oxide 93.0-97.0 wt.% with an average particle size of 51.8-35.7 nm.

1 cl, 3 dwg, 1 tbl