Abstract
In this work, A series of nanocrystalline Ca-Ba-Co-based Y-type hexaferrite having general chemical formula CaBaCo2-xZnxNdyFe12-yO22 where x = 0.00 to1.0 and y = 0.00 to 0.1 were prepared using the sol-gel autocombustion technique. Prepared samples were characterized by X-ray diffraction (XRD), Fourier transform infrared radiation (FTIR), vibrating sample magnetometer (VSM), and dielectric measurements. XRD analysis of samples having various dopants concentrations in powder system matrix revealed that there was a single-phase pattern of Y-type hexaferrite. The measured structural parameters via lattice constants (a, c), unit cell volume V-cell, X-ray density (d(x)), bulk density (d(b)), and porosity (P) were calculated through XRD data. FTIR (Fourier transform infrared) spectroscopy analysis showed the locations of ions including their corresponding bonds in the structure of the lattice matrix. It was observed that with increasing the Zn-Nd concentration the values of the dielectric parameters were decreased. At low frequency, due to surface charge polarization, the measurements of dielectric constant and dielectric loss were observed to be higher. Resonance peaks for all examined samples were also observed. Dielectric parameters consisting of impedance and modulus study attributed the presence of grains, while the grain boundaries might play a significant role in conduction mechanism. Magnetic characteristics measured from M-H (Hysteresis loop) curve that was measured from VSM represents that the prepared sample exhibits typical characteristics associated with the ferromagnetic substances. The calculated values for saturation magnetization and coercivity were found in the range from 25.8 to 51.1 emu/g and 0.061-0.063Oe. The increasing Ms and Hc values revealed that the prepared sample powder could be a leading candidate for PMR (perpendicular recording media) applications. Because of suppression of magnetic super exchange interaction anomalous behavior in magnetic parameters of Zn-Nd-doped was observed. The prepared samples with superb structural and magnetic characteristics are capable for high-frequency applications.