Structural, Electrical, Dielectric and Magnetic Properties of Al3+ Substituted Ni-Zn Ferrite

The work is devoted to the study of structural and frequency-dependent dielectric properties of Ni-Zn ferrite with Al3+ substitution by means of standard double sintering method. Several physical properties of the ferrite powder were characterized after confirmation of single-phase spinel structure. In the present investigation, the lattice constant initially increases from x = 0.0 to 0.2 and then it decreases with Al3+ content. The crystallite size (t = 2.7˜4.2 μm) was estimated from X-ray diffraction studies, and it follows the behaviour of the lattice constant accordingly. The dielectric parameters ε′ and ε″ measured at 1 kHz were found to be greater than those measured at 10 kHz. The analysis of χT/ χRT plots shows the multidomain nature of the prepared Ni0.7Zn0.3AlxFe2−xO4 samples. It was observed that the activation energy is lower in the case of the ferrimagnetic region (Ef), whereas it is higher in the paramagnetic region (EP). The saturation magnetization σs and magneton number nB decrease with increase in Al3+ content. The concluding analysis of the studied Ni0.7Zn0.3AlxFe2−xO4 contributes to ferrite research and may vary its range of application.