Preparation and Microwave Absorption Properties of Ce-doped BaTiO3
铈掺杂钛酸钡微粉制备与微波吸收特性研究

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--18GHz, 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 15dB and 30dB at 5.8GHz and 7GHz, 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.