The composition is iron, iron oxide is not magnetic.
Most of the magnetic materials are iron-containing compounds which is correct because the magnets are in most cases a mixture.
The atomic structure of cobalt and nickel is special, and the atom itself has a magnetic moment. Generally, these mineral molecules are disorderly arranged. When the magnetic regions interact with each other, no magnetism is revealed, but under the guidance of an external force (such as a magnetic field), the direction of the molecules tends to be uniform, and magnetic properties are exhibited, which is commonly known as a magnet.
Ferric oxide is a black crystal with magnetic properties, commonly known as magnetic iron oxide. It is a complex oxide, of which 1/3 is Fe2+ and 2/3 is Fe3+. Fe3O4 can be regarded as a compound formed by FeO and Fe2O3.
Ferric oxide is a black crystal, which is heated to the melting point (1594±5°C) and decomposed at a relative density of 5.18. It has good magnetic properties and is also called “magnetic iron oxideâ€. It is the main component of natural magnetite, and it is easily oxidized into iron oxide in the air under humid conditions. Do not dissolve in water, soluble in acid. Modern tests have shown that it is actually a mixed valence compound of iron, and the chemical formula should be FeIIFeIII [FeIIIO4]. In magnetite, since Fe2+ and Fe3+ are substantially disorderly arranged at the octahedral position, electrons can rapidly transfer between the two oxidation states of iron, so the ferroferric oxide solid has excellent electrical conductivity. Ferric oxide can be obtained by heating iron in steam or by reducing the iron oxide at 400 ° C with hydrogen. Ferric oxide is used as a pigment and polishing agent. Magnetic iron oxide can be used to make recordings, video tapes and telecommunications equipment.
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