【摘要】 采用溶胶-凝胶法制备了稀土铈掺杂钛酸钡纳米晶粉体,借助XRD、Raman、SEM以及矢量网络分析仪等分析测试手段对样品晶相、晶格常数、粒径、表面形貌及微波吸收特性进行了研究.结果表明:铈掺杂样品均形成四方相钛酸钡微晶,晶粒发育良好.随着铈掺杂量增大,晶粒逐渐细化,晶格常数a变大,晶格常数c减小;与未掺杂钛酸钡相比,在2～18GHz频率范围内,稀土铈掺杂材料(掺杂量0.2%)的反射损耗明显地提高,反射峰发生蓝移,尤其5.8GHz和7GHz处反射损耗分别提高了15dB和30dB,频带拓宽近2倍.由此可见铈掺杂有利于改善钛酸钡材料的微波吸收特性.更多还原

【Abstract】 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 an- alyzer.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.更多还原