Exploring structural, magnetic and dielectric properties of Ba1−xCoxFe12O19 hexaferrites

This article presents a comprehensive investigation into the structural, magnetic, and dielectric properties of Ba<inf>1−x</inf>Co<inf>x</inf>Fe<inf>12</inf>O<inf>19</inf> (x = 0.00, 0.10, 0.20, 0.30, 0.40 and 0.50) prepared at 1100 °C using the heat treatment method. The FTIR analysis revealed the formation of the ferrite phase. XRD analysis provided valuable crystallographic parameters and confirmed the formation of M-type hexaferrites along with a BaFe<inf>2</inf>O<inf>4</inf> phase. TGA investigations elucidated the thermal stability after 600 °C. VSM measurements unveiled the variation in magnetic saturation with cobalt substitutions from 24.390 to 41.629 Am² kg⁻¹; coercivity from 1508 to 3577 Oe. Formed samples are magnetically hard in nature. The dielectric measurements indicate that the conduction observed at low frequencies can be attributed to the presence of grain boundaries, while the conduction observed at higher frequencies is mostly influenced by the grains themselves. All samples have a frequency-dependent increase in AC conductivity. These findings contribute to the understanding of its potential applications in the automotive industry, sensors, biomedical applications and related fields.