Effects of Ti doping on structure and microwave absorption properties of Pr_2Fe_(17) alloy

摘要

The Pr_2Fe_(17-x)Ti_x (x = 0.0, 0.1, 0.2, 0.3, 0.4) powder were prepared by arc smelting and high energy ball milling method. The phase structure, morphology, magnetic properties and electromagnetic parameters of the powders were characterized by X-ray diffraction, scanning electron microscopy, vibrating sample magnetometer and vector network analyzer, respectively. The results indicate that the lattice parameter a and c and unit-cell volume V increase linearly with the increasing amount of Ti doping. The saturation magnetization of the Pr_2Fe_(17-x)Ti_x alloys decreases with the increase of Ti content. The minimum absorption peak frequency shifts towards higher frequency region upon the Ti substitution. And the minimum reflection loss of the Pr_2Fe_(17-x)Ti_x alloys increases with the increase of Ti content. The minimum reflection loss of Pr_2Fe_(16.6)Ti_(0.4) powder reaches about -32.50 dB at 5.36 GHz, and the frequency bandwidth of R ＜ -10 dB reaches about 1.52 GHz with the best matching condition d = 2.5 mm.