Structural, magnetic, and dielectric properties of Ti4+-M2+co- doped BaFe11Ti0.5M0.5O19 hexaferrites (M=Co2+, Ni2+, Zn2+)

Pure BaFe12O19 and Ti4+ - M2+ co-doped BaFe11Ti0.5M0.5O19 (M = Co2+, Ni2+, Zn2+) hexaferrites were synthesized by a co-precipitation method. X-ray diffraction (XRD) patterns confirmed the formation of single-phase M-type hexagonal structure with P63/mmc space group. The structural analysis indicated that Ti - Ni and Ti - Zn co-doped samples enhanced the values of lattice parameters (a, c) and cell volume (V) in comparison to Ti - Co sample. Scanning electron microscopy (SEM) was used to investigate the effects of co-doping on the microstructure, whereas the elemental composition of prepared samples was verified by the energy dispersive X-ray spectroscopy (EDX). Impedance spectroscopy measurements revealed a significant variation in the dielectric properties of Ti4+ - M2+ co-doped samples which can be associated with the values of grain and grain boundary resistance. The magnetic hysteresis loops exhibited a ferrimagnetic behavior at room temperature. However, Ti Ni and Ti - Zn co-doped samples showed considerably high values of magnetization along with reduced coercivity. These variations in the obtained results are elucidated based on the site preferences of co-doped ions, mobility of charge carriers, and microstructure. Here, our findings of high dielectric permittivity, diminished dielectric tangent loss, better conduction, moderate magnetization and reduced coercivity for the Ti - Ni codoped BaFe11Ti0.5Ni0.5O19 sample make this composition favorable for electromagnetic absorbing applications.

Automated summary

Pure BaFe12O19 and Ti4+ - M2+ co-doped BaFe11Ti0.5M0.5O19 (M = Co2+, Ni2+, Zn2+) hexaferrites were synthesized using a co-precipitation method. The Ti - Ni and Ti - Zn co-doped samples showed enhanced lattice parameters and cell volume, increased dielectric properties and reduced coercivity, making them favorable for electromagnetic absorbing applications. These variations in properties are attributed to site preferences of co-doped ions, charge carrier mobility, and microstructure.