Structural and Magnetic Properties of Mn-Ni-Cu Substitution of Z-type Barium Hexaferrite Nanoparticles Prepared by the Coprecipitation Method

In this study, the effects of substitution of divalent ions such as Mn, Ni, and Cu on the structural and magnetic properties of Z-type barium hexaferrite with a composition of Ba3Co2-xMnxNixCuxFe24O41 (x = 0-0.5) were investigated. X-ray diffraction (XRD), Fourier transformed infrared spectroscopy (FTIR), field emission scanning electron microscopy (FE-SEM), and a vibrating sample magnetometer (VSM) analysis were carried out to investigate the structural and magnetic properties of samples. The XRD results showed that the Z-type ferrite phase was formed successfully in all samples, and the average crystallite size of the pure sample was also larger than those of substituted samples. FE-SEM micrographs showed that the average particle size was decreased with increasing x. The FTIR spectra also indicated that there are two bands characterizing ferrites in the range of 431-589 cm(-1). They were identified as the metal-oxygen stretching vibrations of Ba-Z hexaferrite. The VSM results showed that with an increase in the amount of dopant from x = 0 to x = 0.2, the saturation magnetization and coercivity were increased from 50 emu/g and 186 Oe to 58 emu/g and 1255 Oe, respectively.