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Why is Fe3O4 magnetic and how is magnetic generated?

October 29,2018.
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. Hard to dissolve in water, soluble in acid (Fe3O4 + 8H + = Fe2+ + 2Fe3 + + 4H2O), insoluble in alkali, and insoluble in organic solvents such as ethanol and ether. However, natural Fe3O4 is insoluble in acid.
Fe3O4 can be regarded as FeO·Fe2O3, which is considered to be a salt of iron (III) acid by X-ray studies.
In addition, it is also a conductor, because in magnetite, since Fe2+ and Fe3+ are substantially disordered in the octahedral position, electrons can rapidly transfer between the two oxidation states of iron, so the ferroferric oxide solid has Excellent electrical conductivity.
The iron wire is burned in oxygen to form triiron tetroxide; the iron is heated to 500 ° C in the air, and the iron reacts with the oxygen in the air to form triiron tetroxide (phenomenon: Mars is shining, forming a black solid - triiron tetroxide) Experiment in the laboratory to pay attention to the experiment, the reason for laying a layer of fine sand or water at the bottom of the bottle is to prevent the melt from bursting the bottom of the bottle!); the blue-gray debris scattered around the forged anvil is mainly triiron tetroxide; The iron is displaced with high-temperature steam to form triiron tetroxide and hydrogen; the main component of natural magnetite is crystals of triiron tetroxide. Ferric oxide is an important common iron compound.
Ferric oxide is a ferrite, Fe2+Fe3+ (Fe3+O4).
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