Metal-oxide doping enhances electromagnetic wave absorption performance of BaFe12O19 glass-ceramics

Elimination or reduction of electromagnetic wave pollution is receiving increasing attention; development of high-performance wave-absorbing materials has become key to solving this problem. In this study, BaFe12O19 crystals were precipitated in a BaO–Fe2O3–B2O3–SiO2 glass system using the melt-quench-second heat treatment method. The microstructure and magnetic properties of the BaFe12O19 glass ceramics and their electromagnetic wave loss characteristics were analyzed. The composition of the crystals in the glass can be modified by introducing other metal oxides, such as ZrO2 (BFO-Z), TiO2 (BFO-T), and Al2O3 (BFO-A), to enrich the heterogeneous interfaces and increase the dielectric loss of the material. The maximum effective absorption bandwidth of BaFe12O19 glass-ceramics with addition of ZrO2 (BFO-Z) was increased to 3.20 GHz; the minimum reflection loss was reduced to −45.60 dB. This simple method represents a new direction for fabricating high-performance wave-absorbing materials.