Ferric oxide Nanopowder is a crystal, and its internal molecules are arranged in a regular manner, and the molecular current orientation is uniform, resulting in magnetic properties. When the magnet is brought close to the ferromagnetic substance, it is magnetically affected by the magnet, and the internal molecular current of the ferromagnetic substance tends to be regularly oriented and magnetic, and the process is called magnetization. It has been proved by research that Fe3O4 is an iron (III) acid salt, namely FeIIFeIII [FeIIIO4]. Black crystals, density 5.18 g / cm3. Magnetic, so it is also called magnetic iron oxide. The humidified ferroferric oxide is easily oxidized into iron oxide in the air. Do not dissolve in water, soluble in acid. Used as a pigment and polish. Magnetic iron oxide is used to make audio tapes and telecommunication equipment. It is prepared by reacting red hot iron with steam. Because it is magnetic, also known as magnetic iron oxide. Ha...
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