In modern detection technology, the integration of lidar and microwave radar significantly increases the risk of exposure for high-value military equipment. Developing materials with multi-band stealth compatibility is a critical countermeasure to mitigate detection risks. In this study, a brownish-yellow samarium iron oxide material compatible with both 1.06 μm laser stealth and radar stealth was synthesized using the co-precipitation method, whose properties can be tuned by varying the raw material ratios. When the samarium-to-iron (Sm:Fe) ratio was 3:7, the primary crystalline phase was Sm 3 Fe 5 O 12 . Conversely, at Sm:Fe ratios of 1:1, the primary crystalline phase shifted to perovskite-type SmFeO 3 . Notably, Sm 3 Fe 5 O 12 material, prepared with a samarium-to-iron molar ratio of 3:7 and sintered at 800°C, demonstrated a reflectivity of 29.6 % at 1064 nm and excellent microwave absorption performance at 14.64 GHz, achieving a minimum reflection loss (RL min ) of −24.56 dB at a thickness of 4 mm and the effective absorption bandwidth of 1.36 GHz (13.76–15.12 GHz). This study provides a simple method for synthesizing brownish – yellow magnetic samarium iron oxide, which shows wide application in laser stealth, radar stealth and visual camouflage in plateau desert environments.
Yuang Chen,Yang Zou,Lili Zhao,Zijian Lei,Nan Wang,Lixin Song
Laser stealth and laser protection are a contradictory due to the opposite requirement in reflectivity. Introducing nonequilibrium surface oxygen vacancy into high-reflectivity materials is a method to compatibly realize laser stealth and laser protection. Herein, nonequilibrium surface oxygen vacancy is introduced into the titanium-based perovskite materials (CaTiO 3 , SrTiO 3 , BaTiO 3 ) producing high-absorption materials with reflectivity below 10%, and the materials possess an optical transformation property. The distribution of the oxygen vacancy is characterized by TEM and EELS, and a core-shell structure is observed, with a disordered shell covering a crystalline core. Under laser irradiation, the materials can transform to high-reflectivity state and reflect most of the laser energy to prevent laser damage. Among these materials, BaTiO 3 possesses the fastest transformation rate of 2000 ms and the highest reflectivity of 70%, which is ascribed to the low thickness of the disordered shell and the fast diffusion coefficient of the oxygen atom.
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