Constructing flower-like porous Bi0.9La0.1FeO3 microspheres for excellent electromagnetic wave absorption performances

Uniform flower-like porous Bi0.9La0.1FeO3 microspheres etched for 30, 60 and 90 min (named as pBLFO-30, pBLFO-60 and pBLFO-90, respectively) have been successfully constructed by a facile chemical etching process based on Bi0.9La0.1FeO3 particles (BLFO) as precursors. In particular, Sample pBLFO-60 has the largest specific surface area of 75.09 m2 g−1, which leads to the most outstanding electromagnetic wave attenuation performance. The optimal reflection loss (RL) value reaches −57.9 dB when the matching thickness is 2.9 mm at 6.9 GHz and the effective absorption bandwidth (RL < −10 dB) is 2.7 GHz (6.1-8.9 GHz). The three-dimensional porous architecture and enhanced magnetic loss make great contribution to the electromagnetic wave absorption performance, among which the porous microstructure ensures multiple scattering and enhances the magnetic loss contributing to better impedance matching. Meanwhile, the electromagnetic wave absorption performance of porous BLFO microspheres are superior to those of most porous electromagnetic wave absorbers, implying their potential application as novel electromagnetic wave absorbing materials.