Structural, magnetic and dielectric study of Cu substituted NiZn ferrite nanorod

Abstract

The Cu2+ doped Ni0.5−xCuxZn0.5Fe2O4 (with x=0, 0.1, 0.2 and 0.3) ferrites of nanorods morphology was synthesized by glycine–nitrate auto-combustion method. The samples presents the diffraction peaks of cubic spinel crystal structure with Fd3̅m space group. An average crystallite size of 47nm is obtained for undoped Ni0.5Zn0.5Fe2O4. The Cu (x=0.1) doping is increased the crystallite size to 50nm, thereafter, it is decreased to 42 and 38nm at x=0.2 and 0.3 respectively. The lattice parameter is found to increase from 8.354Å to 8.408Å with increasing the Cu2+ content. The formation of ferrite phase is further confirmed by obtaining the active Raman mode peaks of A1g+Eg+3T2g bands in all samples. The bands are linked with the symmetric and asymmetric stretching as well as the symmetric bending. The Cu (x=0.1) doping showed 20% enhancement in coercivity, i.e. 105Oe and 16% enhancement in saturation magnetization 87.16emu/g compared to 87Oe and 73.13emu/g at x=0. The dielectric constant of 450 for the Cu (x=0) and 50 for Cu (x=0.1) is obtained at a constant frequency of 100Hz. The dielectric loss as low as 0.05 is measured for Cu (x=0.1) at 1MHz.