Effect of Pr2Fe17 alloy doping Cr on magnetic and microwave absorption properties

The Pr2Fe17-xCrx (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 Pr2Fe17-xCrx 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 Pr2Fe17-xCrx particulates are 1.56, 1.47, 1.67, and 1.71 mu m, 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 Pr2Fe17-xCrx shifts towards a lower frequency region with the increase of Cr doping amount. The minimum reflection loss (RL) of the Pr2Fe17-xCrx composite absorbers decreases first and then increases with the increase of Cr doping amount. The Pr2Fe16.9Cr0.1 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.

Automated summary

The study on Pr2Fe17-xCrx alloys reveals that the saturation magnetization and minimum absorption peak frequency increase with the increase in Cr doping amount, while the minimum reflection loss first decreases and then increases. The Pr2Fe16.9Cr0.1 composite absorber shows excellent microwave absorption properties with a minimum reflection loss value of up to -33.81 dB at 7.28 GHz and an effective absorption bandwidth of 2.24 GHz.