Abstract
CdFe 2O 4, ZnFe 2O 4, and several mixed ferrites Cd x Zn 1− x Fe 2O 4 were prepared, in polycrystalline form, by solid-state reaction of mixtures of CdO, ZnO, and Fe 2O 3 at 1223 K. The resulting materials were found to have the spinel-type structure. X-ray powder diffractometry was used to determine the unitcell length, the oxygen parameter, and the distributions of Cd 2+, Zn 2+, and Fe 3+ in tetrahedral and octahedral coordination. CdFe 2O 4 and ZnFe 2O 4 are 14 and 21% inverse, respectively. Up to x = 0.75, Cd 2+ was found to replace Zn 2+ exclusively at tetrahedral sites. The results are discussed in terms of the tetrahedral preference of the cations involved alongside the lattice distortion caused by steric effects.
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