LAUSR

Abstract The effects of Zn–Ti substitution on magnetic and microwave properties of Ba4Mn2Fe36-2xZnxTixO60 (0.0 ≤ x ≤ 3.0, in the steps of 1.0) U-type hexaferrite have been investigated. Le Bail refinement of XRD patterns confirms the formation of U-type phase in the prepared samples. The particle size, estimated from scanning electron micrographs (SEM), is found in the range of ∼5–15 μm for all the prepared samples. On increasing the dopants concentration from x = 0.0 to x = 3.0, the both saturation magnetization (Ms) and coercivity (Hc) values first increase (up to x = 1.0) and then decreases (for x > 1.0). The Zn–Ti substitution is found to have significant effect on the dielectric and magnetic losses of the as-prepared samples. The results indicate that x = 2.0 sample exhibits excellent reflection loss (RL) of −30.9 dB (99.9% MW absorption) at 11.9 GHz frequency. In addition, x = 3.0 composition sample displays a broad frequency bandwidth of ∼4.5 GHz for RL ≤ −10 dB (90% MW absorption). The enhancement in MW absorption with Zn–Ti substitution can be assigned to the synergistic effects between complex permittivity and permeability values.