Abstract FeCo nanoparticles were prepared using KBH4 as a reducing agent through chemical reduction method and then annealed at 400-600 ℃. FeCo nanoparticles were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and vibrating sample magnetometer (VSM). The electromagnetic parameters of FeCo nanoparticles were measured by network vector analyzer (NVA). The microwave absorbing properties of FeCo nanoparticles were analyzed. The effect of annealing temperature on the microwave absorbing properties of FeCo nanoparticles was studied. The results show that the sample prepared under chemical reduction has the maximum reflection loss of -14.9 dB at 2.24 GHz and at the thickness of 5.0 mm, and the main loss mechanism is dielectric loss. With annealing temperature increasing from 400 ℃ to 600 ℃, the dielectric loss decreases and the magnetic loss increases. The sample has the optimal matching performance and the strongest reflection loss after annealed at 400 ℃. The reflection loss of -49.14 dB at 4.48 GHz can be obtained at a thickness of 3.55 mm.
LIU Yanzi,SU Yuchang,DONG Qiaoqiao, et al. Effect of annealing treatment on microwave absorbing properties of FeCo nanoparticles[J]. Materials Science and Engineering of Powder Metallurgy, 2021, 26(1): 24-31.
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2021, Vol. 26 
