(1-x)(K_0.5Na_0.5)NbO₃-xBa_0.985La_0.01TiO₃无铅陶瓷的微观结构及电性能研究  

Microstructure and Electrical Properties of (1-x)(K0.5Na0.5)NbO3-xBa0.985La0.01TiO3 Lead-Free Ceramics

作　　者：程花蕾[1,2] 肖健[1] 高鹏[1] 严云云[1] 高拴平[1] 

机构地区：[1]宝鸡文理学院化学与化工学院陕西省植物重点实验室,陕西宝鸡 [2]西北工业大学凝固技术国家重点实验室,陕西西安

出　　处：《材料科学》2017年第1期39-47,共9页Material Sciences

基　　金：宝鸡文理学院重点项目(No.ZK15044),陕西省教育厅专项项目(No.15JK1021),国家青年科学基金项目(No.21501007)。

摘　　要：采用传统固相烧结法制备(1?x)(K0.5Na0.5)NbO3-xBa0.985La0.01TiO3 (KNN-xBLT, x = 0.01、0.02、0.04、0.05)无铅陶瓷并研究了BLT掺杂对KNN陶瓷性能的影响。结果表明:BLT的掺杂抑制了KNN-xBLT陶瓷晶粒的生长使陶瓷晶粒尺寸更均匀。在室温至350℃范围内,KNN-xBLT陶瓷的介电常数随着BLT掺杂量的增加而增大且居里温度向低温方向移动。0.95KNN-0.05BLT陶瓷是一种弛豫铁电体且在室温至350℃范围内最大介电常数4000,介电损耗小于0.02,暗示其在高温陶瓷电容器介质材料方面的应用潜力。在研究的组成范围内,KNN-xBLT陶瓷的相结构随BLT掺杂量的增加由正交相转变为四方相,当x = 0.04时,KNN-xBLT陶瓷为正交和四方两相共存。0.96KNN-0.04BLT陶瓷因正交相和四方相共存压电性能有所提高(d33 = 185 pC/N, kp = 0.39),但距铅基压电陶瓷的性能还有差距。The (1?x)(K0.5Na0.5)NbO3-xBa0.985La0.01TiO3 (KNN-xBLT, x = 0.01, 0.02, 0.04, 0.05) lead-free ceramics were prepared by the conventional solid-state sintering method. It was found that the phase structure of KNN-xBLT ceramics changed from the orthorhombic phase to the tetragonal phase with the increase of BLT content. When x = 0.04, the phase structure of KNN-xBLT ceramics was orthorhombic and tetragonal phase coexisting. The density increased and the grain size decreased with BLT increased. The dielectric constant of the KNN-xBLT ceramics increased with the increase of BLT content and the Curie temperature shifted to the low temperature in the temperature range from room temperature to 350?C. The 0.95KNN-0.05BLT ceramic was a relaxor ferroelectric with high dielectric constant of ? >4000 and the low dielectric loss of tanδ 33 = 185 pC/N, kp = 0.39.

关 键 词：无铅陶瓷 铌酸钾钠 电性能 

分 类 号：TQ174[化学工程—陶瓷工业]