The spinels are one of the most extensive series of related chemical compounds known. The mineral spinel Mg 2+ Al 2 3+ O 4 2- can be modified by substitution by a wide range of divalent and trivalent cations to replace Mg 2+ and Al 2 3+ respectively. The spinel crystal structure is physically flexible which leads to a wide range of physical properties and therefore practical applications. Spinel ferrites are extensively used in the field of electronics and increasingly for miniaturisation
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N. W. Grimes (1975) studied this question.
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