Enhanced microwave absorption properties in BiFeO3 ceramics prepared by high-pressure synthesis

Multiferroic BiFeO3 nanoparticles and ceramics have been successfully prepared by sol-gel method and following high-pressure synthesis. The denser samples, good crystallization and crystal structure deformation have been obtained via high-pressure synthesis proved by XRD. SEM and Raman spectra. The enhanced magnetization of high-pressure samples attributes to crystal structure deformation; moreover, the enhanced dielectric loss of high-pressure samples results from good crystallization. The better microwave absorption properties can be obtained by high-pressure synthesis, and the minimum reflection loss elevates from -13 dB at 12.4 GHz to -17 dB at 11.2 GHz. It means that the high-pressure synthesis can effectively improve microwave absorption properties of multiferroic materials. (C) 2010 Elsevier Ltd. All rights reserved.