Structural, Magnetic, Electrical and Dielectric Characterizations of Co0.5Ni0.5FeCuO4 Ferrite

The Co_0.5Ni_0.5FeCuO₄ compound was elaborated using sol-gel reaction route. X-ray diffraction patterns indicated that the sample crystallize in the cubic spinel structure (Fd-3m space group). Magnetic measurements revealed that the prepared sample showed a paramagnetic-ferromagnetic transition at T_C= 785 K. Then, dielectric data has been carried out by means of impedance spectroscopy in a wide frequency and temperature ranges. For the sample, the activation energy E_a estimated from the slope of the linear fit plot is equal to 0.42 eV at temperature range 200-420 K. The electrical modulus and impedance studies reveal the presence of a relaxation phenomenon with non-Debye type in the prepared sample. Nyquist representation (Z″ vs. Zʹ) was plotted and their characteristic behavior was analyzed in terms of electrical equivalent circuit.