Fabrication of BaFe12O19 /CeO2 composite for highly efficient microwave absorption.

• BaFe 12 O 19 /CeO 2 composites were prepared by solid-state reaction method. • BaFe 12 O 19 is a high magnetic ferrite and CeO 2 is a dielectric semiconductor. • The minimum reflection loss achieved − 51.2 dB. • The absorption ability was improved due to the synergistic effects of BaFe 12 O 19 &CeO 2. Hexagonal barium ferrite (BaFe 12 O 19) is a promising microwave absorption material, due to high magnetic loss and stable chemical state. However, the poor electrical performance of BaFe 12 O 19 will lead to impedance mismatch and poor absorption capacity. Compounding with other dielectric materials is a feasible way to solve the above problems. In this work, BaFe 12 O 19 + x% CeO 2 (x = 0, 0.16, 0.31, and 0.64) were prepared by conventional solid state reaction method. The microwave absorption performance of BaFe 12 O 19 /CeO 2 composites was significantly improved in comparison with single BaFe 12 O 19 , which is mainly correlated with the synergistic effects of magnetic loss, dielectric loss and multiple reflections. The x = 0.31 sample exhibited the minimum reflection loss of − 51.2 dB at 6.5 GHz and bandwidth with the loss above 10 dB is about 2.7 GHz. In addition, when x = 0.64, the reflection loss of - 23.6 dB could be achieved at only 1.8 mm and effective bandwidth is 3 GHz. Consequently, the facile preparation pathway and excellent performance make BaFe 12 O 19 /CeO 2 composite a promising candidate for efficient low-frequency electromagnetic wave absorbing. [ABSTRACT FROM AUTHOR]