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

Abstract Pure B a F e 12 O 19 and T i 4 + − M 2 + co-doped B a F e 11 T i 0.5 M 0.5 O 19 (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 P 6 3 / m m c space group. The structural analysis indicated that T i − N i and T i − Z n co-doped samples enhanced the values of lattice parameters ( a , c ) and cell volume ( V ) in comparison to T i − C o 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 T i 4 + − M 2 + 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, T i − N i and T i − Z n 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 T i − N i co-doped B a F e 11 T i 0.5 N i 0.5 O 19 sample make this composition favorable for electromagnetic absorbing applications.