Effect of different rare-earth elements substitution on microstructure and microwave absorbing properties of Ba0.9RE0.1Co2Fe16O27 (RE=La, Nd, Sm) particles

► Lattice parameter of 'a' and 'c' for RE-doped test are lesser than un-doped ferrite and decreased often with the decrease of RE ionic radius. ► The complex permittivity and complex permeability in the range from 0.5 to 18.0 GHz were measured by vector network analyzer. ► The microwave absorption properties were characterized by tan δ, which was calculated using the formula of tanδ=tanδe+tanδm. ► Reasons of phenomenon be conferred by interfacial polarization, intrinsic electric dipole polarization and ferromagnetic theory.