7.10 Ferrimagnetic substances [Ferrites]
In ferrimagnetic crystals, the magnetization of two sublattices occurs as the one in anti-ferromagnetic crystals but of unequal magnitudes, which results a non-zero value. The ferrimagnetic crystals consist of two or more different kinds of atoms. Chemically, they are expressed as Me++ Fe2+++ O4−−, where Me++ stands for a suitable divalent metal ion such as Fe++, Co++, Ni++, Mg++, Mn++, Zn++, Cd++, etc. The Fe2+++ is a trivalent ferric ion. If we insert Ni++ for Me++, then the compound would be called as nickel ferrite, if Fe++ is inserted for Me++, then the compound is ferrous ferrite, written as Fe++ Fe2+++ O4−− or in more familiar form as Fe3 O4.
X-ray crystallography reveals that usually ferrite oxygens ...
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