Magnetic Ceramics and their Applications

Material Curie temp.. K 5sa, T) (d RT Calculated moments Experi- mental 

For the sake of simplicity, the moments were calculated by using the classical expression [Eq. (15.21)] rather than the more accurate quantum mechanical result given in Eq. (15.27). Fe is included for comparison purposes. 

Magnetic ceramics are further classified according to their crystal structures into spinels, garnets, and hexagonal ferrites. Typical compositions and some of their magnetic properties are listed in Table 15.4. 

It is the crystal field energy or ligand field splitting (see Chap. 16) that stabilizes the inverse spinel. 

Its structural relationship to spinel becomes apparent when its formula is rewritten as FeO Fe Oj. 

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