Preparation and multiple-band stealth properties of SmFeO₃

SmFeO₃ powders were prepared by solid state reaction. The phase composition and surface appearance of the obtained SmFeO₃ powders were characterized by XRD, and SEM, respectively. In addition, the microwave electromagnetic properties, the infrared emissivity and the reflectivity at 1.06 μm wavelength of SmFeO₃ powders were measured. The results showed that the pure SmFeO₃ was formed when the calcining temperature was 1250°C, and the obtained SmFeO₃ showed an orange-red color. Moreover, the particles exhibited irregular blocky shape, and the average size was about 2-4 μm. For the single SmFeO₃ microwave absorber, the maximum reflection loss (RL) was about-10dB at 15.8 GHz. The RL reached-5dB in the frequency range of 14.3-16.8 GHz. At the same time, the SmFeO₃ particles not only had strong laser absorption with 0.41% reflectivity at 1.06 μm wavelength but also had low infrared emissivity of 0.66.