Abstract
Mixed ferrites with nominal chemical compositions Co0.5Zn0.5CrxFe2−xO4 ranging from x=0 to 0.5 in the steps of 0.1 have been prepared by the standard solid state reaction method. XRD patterns confirm single phase and formation of cubic spinel structure. The lattice constant (a0), average grain size (D) and bulk density (ρB) are decreased with increasing Cr content. The ρB decreases with Cr content due to lighter atomic weight. On the other hand, both D and ρB of each composition increase with increasing sintering temperature (Ts). All samples show reentrant spin glass transition at low temperature in zero field cooled magnetization. The saturation magnetization (Ms) and Néel temperature (TN) decrease with Cr substitution due to weakening the super-exchange interaction. The coercivity (Hc) increases with increasing Cr content for various Co0.5Zn0.5CrxFe2−xO4. It may be attributed to the effect of decreasing D. Frequency dependent initial permeability (μ′i) decreases with increasing Cr content. The Ms and ρB play an important role in changing μ′i. On the other hand, the μ′i for each composition increases with increasing Ts. The highest relative quality factor (Q) is observed for various Co0.5Zn0.5CrxFe2−xO4 sintered at 1573K. The DC electrical resistivity (ρDC) of these samples increases with increasing Cr content due to decreasing Fe3+ ions at B-site.
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