【作者】 熊健； 杨兵初； 周聪华； 左舜贵； 梁丽杰；

【Author】 XIONG Jian,YANG Bing-chu,ZHOU Cong-hua,ZUO Shun-gui,LIANG Li-jie (School of Physics science and Technology,Central South University,Changsha 410083,China)

【机构】 中南大学物理科学与技术学院；

【摘要】 采用溶胶-凝胶法制备稀土钕离子掺杂钛酸钡纳米粉体。采用X射线衍射(XRD)、傅里叶红红外光谱、荧光光谱、矢量网络分析仪等手段对样品的微结构,光致发光和高频电磁特性分别进行了表征。结果表明,钕离子掺杂的钛酸钡样品在750℃温度下退火时,其结晶良好。随着掺杂量的提高,晶粒细化,晶格常数变小,最大绿色发光强度不断增强。在2～18GHz范围内,与未掺杂材料相比,5%稀土钕掺杂材料反射损耗明显提高,频宽拓宽显著。综上所述,掺入稀土钕掺杂有效的改善了钛酸钡材料的光学及吸波性能。更多还原

【Abstract】 Nd-doped BaTiO₃ nanocrystallines powder was prepared with modified sol-gel method.Microstruc-ture, photoluminescence and high-frequency electromagnetic properties of the as-synthesized nanocrystallines were characterized by X-ray diffraction（XRD）,IR,fluorescence spectrum and vector network analyzer respectively. It is observed that the samples crystallized well after sintered at 750℃for lh.With the increase of Nd content,both of the lattice constant and the grain size of BaTiO₃ nanocrystallines decreased,while intensity of green luminescence peak of the powder increased.For BaTiO₃ powders doped with 5%Nd,the reflection loss and bandwith increased,and the reflection peak blue-shifted within the tested microwave band compared to that without dopant.Finally,both photoluminescence and microwave absorption properties of the BaTiO₃ can be improved through doping with Nd.更多还原