Abstract:A spherical powder with particle size of 200—500 nm was prepared by orthogonal test using sodium borohydride to reduce Fe and Si in aqueous solutions from ferrous chloride and sodium fluosilicate aqueous solutions. Characterizations using X-ray diffraction (XRD), simultaneous thermal analyzer (STA), X-ray photoelectron spectroscopy (XPS), and inductively coupled plasma (ICP) spectroscopy reveal the powder to be an amorphous alloy composed of Fe87.6Si1.08B11.31. The wave-absorbing properties of the powder were studied by vector network analyzer. The results show that the powder achieves a minimum reflection loss of —44.8 dB at 14.56 GHz with a matching thickness of 1.5 mm, and the effective bandwidth of 6.16 GHz which corresponds to the maximum absorption bandwidth is obtained. The loss of electromagnetic wave is mainly magnetic loss, and the dielectric loss is supplemented, in which the dielectric loss is mainly dipole polarization, and the magnetic loss is mainly eddy current loss and natural resonance.