Hollow multi-shelled structured BaTiO3/Fe3O4 composite: Confined space and interface effect with boosted microwave absorption

Proper structure and composition of materials are essential for their microwave absorption (MA) performance. Herein, hollow multi-shelled structured (HoMSs) BaTiO3/Fe3O4 composite was proposed and prepared using hard template combined hydrothermal method. Compare to the BaTiO3 powder/Fe3O4, the optimal reflection loss (RL) increases from -12.7 to -39.2 dB, and the effective absorption bandwidth (RL < -10 dB) increases from 0.96 to 2.8 GHz for HoMSs-BaTiO3/Fe3O4 composite with a relatively thin matching thickness of 1.7 mm. The special structure result in the characteristics of multiple scattering reflection and oriented polarization. In addition, the heterogeneous interface between HoMSs-BaTiO3 and Fe3O4 enhancing the interface polarization effect, further improving the dielectric loss capacity. This study brings new ideas for the design of new highperformance microwave materials and related mechanism analysis.

Automated summary

In this study, a hollow multi-shelled structured (HoMSs) BaTiO3/Fe3O4 composite was designed and prepared. Compared to BaTiO3 powder/Fe3O4, the composite showed higher reflection loss and wider effective absorption bandwidth. The special structure resulted in multiple scattering reflection and oriented polarization, while the heterogeneous interface between the composite materials enhanced the interface polarization effect, further improving the dielectric loss capacity.