Abstract
In the present study, Nanocrystalline Ni0.5-xZnxCo0.5Fe2-yAlyO4 (0 ≤ x ≤ 0.5 and 0 ≤ y ≤ 1.0) powders were fabricated via the sol-gel auto-combustion route. X-ray diffraction study revealed that the formation of single-phase Al–Zn substituted Ni–Co ferrites which have a cubic spinel structure. The lattice parameter shows a decreasing trend from 8.344 to 8.289 Å with the composition of Al3+-Zn2+. The range of crystallite size calculated from the Scherer formula is 46–6.9 nm. Cation distribution indicates that Zn2+ strongly occupies tetrahedral A-site and Al3+ ions occupied both tetrahedral A-site and octahedral B-site for all composition. Using the vibrating sample magnetometer, it is observed that the Coercive field (Hc), saturation magnetization (Ms), rotational permeability (μrk), anisotropy field (Ha) and anisotropy constant (K1) decreases with increasing the composition of Al3+-Zn2+. Fabricated samples show normal dielectric behavior and dielectric constant is increased with an increase of Al–Zn concentration.
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