The powders of RE2Co17(RE=Y, Ce, Nd, Ho, Er) and HoxCo100–x(x=6, 8, 10, 12) alloys were prepared by the arc melting method and high-energy ball mill process. The compositions and morphologies of the alloys were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM), and the microwave absorbing properties were studied by a vector network analyzer. The results showed that the alloy of Y2Co17 had betterabsorbing properties at low frequencies and its lowest reflectivity value was –9.5 dB at 3.8 GHz. The lowest reflectivity value of Ho2Co17alloy was –13.7 dB at 7.02 GHz and it obtained large absorbing band-width. Reflectivity value less than –5 dB was from 5.1 to 10.2 GHz. Whenx=6 andx=8, the alloys of HoxCo100–x consisted of Ho2Co17 phase and Cophase. They had good radar absorbing properties. With increase in Ho content, the minimum reflectivity value wors-ened and the absorbing peak frequency shifted toward higher frequencies. But whenx=12, the absorbing peak frequency shifted to-ward lower frequencies but the minimum reflectivity value worsened.
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