新型BT-BMT-xBNT无铅高储能密度陶瓷研究  

Novel BT-BMT-xBNT Lead-Free Ceramics with High Energy Storage Density

作　　者：雷磊 吴健 董子晗 卢林 李旭 王良 万昊 LEI Lei;WU Jian;DONG Zihan;LU Lin;LI Xu;WANG Liang;WAN Hao(Electric Power Research Institute of State Grid Shaanxi Electric Power Co.,Ltd.,Xi’an 710100,China;State Grid(Xi’an)Environmental Protection Technology Center Co.,Ltd.,Xi’an 710100,China;State Grid Shaanxi Electric Power Co.,Ltd.,Xi’an 710048,China;Weinan Power Supply Company of State Grid Shaanxi Electric Power Co.,Ltd.,Weinan 714000,China;State Grid Corporation of China,Beijing 100031,China)

机构地区：[1]国网陕西省电力有限公司电力科学研究院,西安710100 [2]国网(西安)环保技术中心有限公司,西安710100 [3]国网陕西省电力有限公司,西安710048 [4]国网陕西省电力有限公司渭南供电公司,渭南714000 [5]国家电网有限公司,北京100031

出　　处：《人工晶体学报》2022年第11期1967-1972,共6页Journal of Synthetic Crystals

基　　金：国家电网公司总部科技项目(5226SX20007C)。

摘　　要：本文采用传统固相反应法,成功制备了新型无铅弛豫铁电陶瓷(1-x)[0.9BaTiO_(3)-0.1Bi(Mg_(0.25)Ta_(0.5))O_(3)]-xBi_(0.5)Na_(0.5)TiO_(3)。结果表明,较高居里温度的Bi^(0.5)Na^(0.5) TiO_(3)的引入,使得材料体系中建立了更多的以Bi—O耦合为主的极性纳米区域,弥补了因Bi(Mg_(0.25)Ta_(0.5))O_(3)的加入导致的宏观极化强度的减少,提高了材料的饱和极化强度,实现了较高储能密度的同时具有更好的温度稳定性。在245 kV/cm电场强度下,x=0.2样品的储能密度约为4.01 J/cm^(3),储能效率约为84.86%,同时该组分在20~170℃储能密度的变化率小于5%,储能效率的变化率小于6%,表现出优异的温度稳定性。In this work,novel lead-free relaxor ferroelectric(1-x)[0.9BaTiO_(3)-0.1Bi(Mg_(0.25)Ta_(0.5))O_(3)]-xBi_(0.5)Na_(0.5)TiO_(3) ceramics were synthesized via composite strategy using the traditional solid-state process.Results indicate that the incorporation of Bi_(0.5)Na_(0.5)TiO_(3) with a high Curie temperature could not only significantly enhance the energy storage density,but also improve the temperature stability.As BNT concentration rose,the nano-scale polarization mismatch dominated by Bi—O coupling was established and enhanced,significantly compensating for the reduction of macroscopic polarization due to the addition of Bi(Mg_(0.25)Ta_(0.5))O_(3),leading to elevate saturation polarization and improve temperature stability.The ceramics which x is 0.2 show optimal energy storage features with a high energy storage density of 4.01 J/cm^(3) in the electric field of 245 kV/cm combined with a relatively high energy storage efficiency of 84.86%.Moreover,excellent temperature stabilities were noticed with the change rate of energy storage density is less than 5%and energy storage efficiency is less than 6%over a broad temperature range(20~170℃).

关 键 词：无铅 弛豫铁电体 能量存储 BaTiO3基陶瓷 储能效率 温度稳定性 

分 类 号：TQ174[化学工程—陶瓷工业]