Preparation and absorbing properties of W-type ferrites BaCoZnRe_0.1Fe_15.9O₂₇

To research the absorbing properties of rare earth doped W-type ferrites, the W-type ferrites, BaCoZnRe_0.1Fe_15.9O₂₇ (Re=Ce, La, Nd), were prepared by a sol-gel method. The properties of Re³⁺ substituted W-type ferrites were studied, and the structures, morphologies, magnetic properties and microwave absorption properties of the samples were characterized by X-ray diffractometer (XRD), scanning electron microscope (SEM), vibrating sample magnetometer (VSM) and vector network analyzer, respectively. The results showed that all the samples were W-type ferrite and exhibited paramagnetism. When Re³⁺ doped in BaCoZnFe₁₆O₂₇, the size of samples was much smaller, the value of ε' decreased while the ε″ value increased, and the magnetic properties of the samples were enhanced. Among this samples, the BaCoZnNd_0.1Fe_15.9O₂₇ showed a much better microwave absorbing properties at 2~13 GHz, and the value of tan δ reached 0.58 at 10.1 GHz.