Preparation and microwave absorption properties of Ce-doped BaTiO₃

Nano-particles of Ce-doped BaTiO₃ were prepared by sol-gel method. The structure, micrograph and microwave absorption properties of the materials were characterized by using X-ray diffraction (XRD), Raman spectroscope, Scanning Electron Microscope (SEM) and vector network analyzer. The BaTiO₃ powders doped with different Ce contents have the same crystalline tetragonal structure. With the increase of Ce content, the crystal sizes of the BaTiO₃ powders decrease with lattice constants a enlarges and c decreases. Within the bandwidth of 2-18 GHz, the reflection loss of 0.2% Ce-doped BaTiO₃ powders is increased and reflection peak has blue shift compared with pure BaTiO₃ powders. Reflection losses of 0.2% Ce-doped BaTiO₃ powders are increased by 15 dB and 30 dB at 5.8 GHz and 7 GHz, respectively, and the bandwidth is widened two times. The above shows that Ce-doping can greatly improve the microwave absorption properties of the BaTiO₃ powders.