Effect of Dy, Pr on microwave absorption properties of Ce₂Co₁₇ alloy

The Re_xCe_2−xCo₁₇ (Re = Dy, Pr, x = 0, 0.1, 0.2, 0.4) alloy was prepared by a combination use method of arc melting and high-energy ball milling and the phase structure, morphology and electromagnetic parameters were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM) and vector network analyzer (VNA), respectively. The consequences demonstrate that the particle size has a decreasing tendency and the minimum absorption peak frequency offsets to a low frequency band with increasing Re (Dy, Pr). The reflectivity of Dy_xCe_2−xCo₁₇ (x = 0, 0.1, 0.2, 0.4) alloy increase first and then decrease with the addition of Dy content, and the Dy_0.2Ce_1.8Co₁₇ alloy can achieve the minimum RL of − 39.16 dB (microwave absorption rate 99.988%) at 8 GHz with the thickness of 1.8 mm. The microwave absorbing properties of Pr_xCe_2−xCo₁₇ (x = 0, 0.1, 0.2, 0.4) alloy can be optimized with the doping of Pr and the minimum RL of Pr_0.2Ce_1.8Co₁₇ can reach to − 36.8 dB (microwave absorption rate 99.979%) at 7.92 GHz, and the bandwidth of R < − 10 dB is 2.24 GHz with the best matching thickness condition of 1.8 mm.