Structural, morphological, electrical and magnetic properties of Dy doped Ni–Co substitutional spinel ferrite

Dysprosium doped Ni0.8Co0.2Fe2-xDyxO4 ferrite is prepared by simple ceramic method with x varied from 0 to 0.1 in step of 0.025. The influence of Dy doping on structural, morphological, electrical and magnetic properties were studied. The formation of ferrite phase was confirmed by X-ray diffraction, which is a characteristic of the spinel ferrite. Increase in average crystallite and grain size has been observed with increase in Dy doping. Prepared samples show the usual dielectric dispersion having Maxwell–Wagner-type interfacial polarization. Reduction in dielectric constant, loss tangent and ac conductivity has been observed with frequency. Room temperature complex impedance analysis shows semicircles attributed to the high resistance values at lower frequencies. Magnetic properties have been studied by measuring M–H plots. - Highlights: ► Preparation of Dy doped Ni–Co ferrite by ceramic method. ► Effect of Dy doping in to Ni–Co substitutional ferrite. ► Structural, electrical and impedance properties of Dy doped Ni–Co ferrite. ► Room temperature magnetic properties of Dy doped Ni–Co ferrite.