Synthesis and electrical behavior of Ni-Ti substituted Y-type hexaferrites for high frequency application

Highlights: • Electrical resistivity increase from 1.8 × 10⁶ to 4.9 × 10⁹ ohm cm. • Activation energy and resistivity are in agreement with each other. • Activation energy and resistivity are in agreement with each other. • Materials are suitable for microwave devices. This article reports the fabrication of Ni-Ti doped derivatives of Sr₂Co₂Fe_12-2xO₂₂ by economical Sol-gel method. At room temperature X-ray diffraction (XRD) pattern of powder was obtained after sintering at 1050 °C. The XRD analysis revealed the formation of pure Sr-Y hexaferrite phase. It was found that the observed values of dielectric parameters decreased with increasing Ni-Ti substitution. The higher values of dielectric constants and dielectric loss factor at lower frequency were owing to surface charge polarization. In all the samples the resonance peaks were also observed. The observed room temperature DC electrical resistivity found to increase from 1.8x10⁶ to 4.9x10⁹ ohm cm. The observed activation energies values of the fabricated materials are found in 0.52–0.82 eV range. The decrease in dielectric parameters and increase in resistivity of the fabricated samples with substituents suggest these materials have worth application in micro-wave devices as such devices required highly resistive materials.