Abstract
BaTiO3 is a promising electromagnetic waves (EMWs) absorption material due to its chemical stability and large dielectric constant. However, the high reflection coefficient of pure BaTiO3 at high frequencies reduced its EMWs absorption capacity. To resolve the issue, BaTiO3/expanded graphite (EG) hybrids were successfully synthesized by high-energy ultrasound assisted heat treatment technology. The combination of BaTiO3 particles and layered EG formed three-dimensional (3D) heterostructure of BaTiO3/EG hybrids, which optimized the impedance matching. Abundant conductive network enhanced interfacial polarization, numerous interface defects and multiple reflections together promoted the attenuation of EMWs. At the molar ratio of 0.2:0.8 between BaTiO3 and EG, the BaTiO3/EG sample with 1.5 mm match thickness displayed −100.6 dB of minimum reflection loss (RLmin) and 5.9 GHz of effective absorption bandwidth (EAB). In addition, the ceramic character of BaTiO3/EG hybrids endowed them excellent high-temperature stability.
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