Abstract:Ferrite and carbonyl iron power are the major absorbing components of conventional radar absorbing materials (RAM). However, conventional RAM made of the aforementioned single-absorbing components cannot meet the comprehensive requirements of “thin, wide, light, and strong.” By analyzing the complementary relationship among ferrite and carbonyl iron power, a carbonyl iron coated core-shell nano composite absorbent system is established. In addition, by changing the deposition temperature to adjust the morphologies and absorbing properties of powders, excellent performance of the new core-shell structure absorbent is obtained. The nano carbonyl iron (CI) shell in situ grown on Ni0.4Zn0.2Mn0.4Ce0.06Fe1.94O4 (NZMCF) surface by metal organic chemical vapor deposition (MOCVD) for using as electromagnetic wave (EMW) absorbing materials. X-ray diffraction, scanning electron microscope and energy dispersive spectrometer analyses show that NZMCF-CI composites successfully prepared with a core-shell structure. Optimizing the weight ratio of CI would likely cause the composites to attain the EM parameters necessary in EMW absorbing materials, a minimum reflection loss (RL) was -39.9 dB to the corresponding thickness was 1.8mm, and the RL exceeds -10 dB from 3.8 to 18.0 GHz. The RL exceeds -20 dB from 3.2 to 18 GHz and -10 dB from 2.5 to 18 GHz for the absorber thickness from 0.8 to 2.6 mm, which covers almost the whole 2 to 18.0 GHz.