METHOD FOR PREPARING IRON OXIDE POWDERS Γ -FEO/FEOWITH ADJUSTABLE PROPERTIES

摘要

The invention relates to a method for preparing iron oxide powders - γ FeO/FeOwith adjustable properties, the iron oxide powders being widely used in mineralogy, geology, chemistry , medicine, biology, catalysis, magnetic data storage, water treatment, pigment industry, and the like. According to the invention, the method starts from aqueous solutions of iron nitrate and ethylenediaminetetraacetic acid in various molar ratios 8/3 or 4/3, in homogeneous mixture, subjected to a heating regime with various durations of 15, 38 or 60 minutes, in a glass flask fitted with a valve, which is opened during the combustion and closed at the end of the combustion, the flask being placed on an electric heating mantle or in the microwave oven for initiating and carrying out the combustion, the thus obtained iron oxide powders having the sizes of crystals between 3...10 nm, the specific surface area of 12 ... 78 m/g and the saturation magnetization between 27.9 ... 82.3 emu/g, they being adjustable according to the iron nitrate/ethylenediaminetetraacetic acid molar ratio, the duration of the combustion reactions and the way of initiation thereof.