Spinels - Ferrites

Normal: [A]t [B2]° O4

Inverse: [B]t [AB]° O4

(and random)

Ferrites: MFe2O4; M= Fe2+, Ni2+, Cu2+, Mg2+

Inverse: Fe3+ d5 ion

no C.F. stabilization in oct site

thus larger M2+ goes in oct site

Ions on tetrahedral sites have spins antiparallel to those on octahedral sites

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