Ferrites. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Electricity for beginners
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Ferrites are non-metallic magnetic materials made from a mixture of specially selected metal oxides with iron oxide.
The name of the ferrite is determined by the name of the divalent metal, the oxide of which is part of the ferrite. So, if zinc oxide is included in the ferrite, then the ferrite is called zinc; if manganese oxide is added to the composition of the material - manganese.
In technology, complex (mixed) ferrites are used, which have higher values of magnetic characteristics and greater resistivity compared to simple ferrites.
Examples of complex ferrites are nickel-zinc, manganese-zinc, etc.
All ferrites are polycrystalline substances obtained from metal oxides as a result of sintering powders of various oxides at temperatures of 1100-1300 ° C.
Ferrites can only be machined with abrasive tools. They are magnetic semiconductors. This allows them to be used in high frequency magnetic fields, since their eddy current losses are negligible.
Author: Smirnova L.N.
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