Effect of Pr 2 Fe 17 Alloy Doping Cr on Magnetic and Microwave Absorption Properties

The Pr 2 Fe 17− x Cr x ( x = 0.0, 0.1, 0.2, 0.4) powders were successfully prepared by arc melting and high-energy ball milling. The crystal structure, morphology, magnetic properties, and microwave absorption performance of the Pr 2 Fe 17− x Cr x alloys was studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), vibrating sample magnetometer (VSM), and vector network analyzer (VNA), respectively. The results show that the saturation magnetization increases with the increase of Cr doping amount. The average particle sizes of Pr 2 Fe 17− x Cr x particulates are 1.56, 1.47, 1.67, and 1.71 μm, which correspond to x = 0.0, 0.1, 0.2, and 0.4, respectively, and the average particle size decreases first and then increases. The minimum absorption peak frequency of Pr 2 Fe 17− x Cr x shifts towards a lower frequency region with the increase of Cr doping amount. The minimum reflection loss (RL) of the Pr 2 Fe 17− x Cr x composite absorbers decreases first and then increases with the increase of Cr doping amount. The Pr 2 Fe 16.9 Cr 0.1 composite absorber exhibits excellent microwave absorption properties, its minimum reflection loss value can reach up to − 33.81 dB at 7.28 GHz, and its effective absorption bandwidth (RL < − 10 dB) is 2.24 GHz with the best matching thickness of 2.2 mm.