La掺杂的低损高效钙钛矿储能介质陶瓷研究  

La doped perovskite dielectrics with high release efficiency and low loss for pulse energy storage

作　　者：张春梅 刘敬松[1] 曾梦诗 李惠琴[1] 余洪滔[1] ZHANG Chunmei;LIU Jingsong;ZENG Mengshi;LI Huiqin;YU Hongtao(State Key Laboratory of Environment Friendly Energy Materials,School of Materials Science and Engineering,Southwest University of Science and Technology,Mianyang 621010,Sichuan Province,China)

机构地区：[1]西南科技大学材料科学与工程学院环境友好能源材料国家重点实验室,四川绵阳621010

出　　处：《电子元件与材料》2020年第6期37-43,49,共8页Electronic Components And Materials

摘　　要：采用固相反应法制备了(1-x)Sr0.7Pb0.2Bi0.1TiO3-xLa2O3(x=0.00%,0.03%,0.06%,0.09%,0.12%,0.15%)介质陶瓷。研究了La3+不同掺杂量对SPBT介质陶瓷弛豫特性和介电性能的影响。利用阻抗分析仪和透射电子显微镜分别证明了弛豫特性和微畴结构的存在。原子力显微镜分析结果表明掺杂La3+促使微畴汇聚长大。由于微畴结构具有低的钉扎效应,在8000次循环充放电测试后,放电曲线与初始曲线基本重合。当La3+掺杂量增加到0.12%(摩尔分数)时,该介质陶瓷表现出98.6%的高能量释放效率和约0.03%的最低介电损耗。The(1-x)Sr0.7 Pb0.2 Bi0.1 TiO3(SPBT)-xLa2O3(x=0.00%,0.03%,0.06%,0.09%,0.12%,0.15%)ceramics were prepared by a solid-state method for pulsed power application.The effects of the La3+content on the relaxation and dielectric properties of SPBT ceramics were studied.The relaxation properties and microdomain structures were demonstrated by impedance analyzer and transmission electron microscope(TEM)respectively.The atomic force microscopy(AFM)show that the La3+doping promotes the microdomains growth.The discharge curve almost coincides with the initial one after 8000 charges-discharges cycles due to the low pinning effect on the microdomain structures.As La3+content increases to 0.12%(mole fraction),the ceramics has a high energy release efficiency of 98.6%and an optimal dielectric loss of approximately 0.03%.

关 键 词：放电效率 介电损耗 掺杂 微畴结构 晶界结构 弛豫特性 

分 类 号：O487[理学—固体物理]