铌酸钠基无铅陶瓷的弛豫反铁电相构筑与储能特性优化  

Relaxor Antiferroelectric Phase and Optimized Energy Storage Properties of NaNbO3-Based Lead-Free Ceramics

作　　者：杨伟伟 曾华荣[1,2] 翟继卫 赵坤宇[1,2] 李国荣[1,2] YANG Weiwei;ZENG Huarong;ZHAI Jiwei;ZHAO Kunyu;LI Guorong(Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 201899,China;College of Materials Science and Opto-Electronic Technology,University of Chinese Academy of Sciences,Beijing 100049,China;School of Materials Science and Engineering,Tongji University,Shanghai 201804,China)

机构地区：[1]中国科学院上海硅酸盐研究所,上海201899 [2]中国科学院大学材料科学与光电技术学院,北京100049 [3]同济大学材料科学与工程学院,上海201804

出　　处：《硅酸盐学报》2024年第4期1200-1210,共11页Journal of The Chinese Ceramic Society

基　　金：国家重点研发计划(2021YFB3800604,2021YFA0716502);国家自然科学基金(51831010);中国科学院上海分院“基础研究特区计划”项目(JCYJ-SHFY-2022-022);上海市“超级博士后”激励计划;国家资助博士后研究人员计划。

摘　　要：开发具有优异综合储能特性的无铅陶瓷电容器是脉冲功率技术领域的迫切需求。相较于其他无铅储能陶瓷体系,Na Nb O_(3)(NN)陶瓷具有结构相变丰富、理论密度低、电学可调性强、轻量化发展潜力大等显著优点,因而备受关注,成为当前的研究热点。基于降低容忍因子稳定反铁电相和增强陶瓷弛豫性的策略,开展了NN基弛豫反铁电陶瓷的制备与储能特性研究。通过引入BiFeO_(3)和Sr(Ti_(0.85)Zr_(0.15))O_(3)成功制备了0.9[0.9NaNbO_(3)-0.1BiFeO_(3)]-0.1Sr(Ti_(0.85)Zr_(0.15))O_(3)陶瓷,相较于纯NN陶瓷(0.14 J/cm^(3)、6.39%)和0.9NaNbO_(3)-0.1BiFeO_(3)陶瓷(3.55 J/cm^(3)和70.61%),其储能特性显著提升,储能密度(Wrec)与储能效率(η)分别达到了5.22 J/cm^(3)、83.92%。其优异的储能特性源于BiFeO_(3)和Sr(Ti_(0.85)Zr_(0.15))O_(3)掺杂对陶瓷的晶粒细化、反铁电相稳定性和弛豫特性的双增强机制。同时,0.9[0.9NaNbO_(3)-0.1Bi Fe O_(3)]-0.1Sr(Ti_(0.85)Zr_(0.15))O_(3)陶瓷表现出良好的温度及频率稳定性,是一种极具应用前景的电介质储能材料。Introduction Pulse power technology has important applications in national defense industry.Dielectric capacitor is one of the energy storage components of pulse power devices.Ceramic dielectric capacitors have some advantages like fast chargingdischarging speed,good electromechanical performance,anti-aging,and resistance to extreme conditions,which can be used in dielectric energy storage.The existing energy storage properties of BaTiO_(3)-based dielectric ceramics are generally low at a high electric field,and lead-based ceramic capacitors are increasingly limited because of the presence of lead as a highly toxic element.It is thus necessary for pulse power technology to develop lead-free ceramic capacitors with superior comprehensive energy storage properties.NaNbO_(3)(NN)ceramics have a rich structural phase transition and a low theoretical density,which makes their electrical properties highly adjustable and is conducive to the development of lightweight capacitors.Recent work on relaxor ferroelectric,anti-ferroelectric and relaxor antiferroelectric NaNbO_(3)-based ceramics are performed.Compared with the typical lead-free antiferroelectric AgNbO_(3),NN as one of of lead-free antiferroelectric materials has some advantages like low theoretical density(i.e.,4.55 g/cm^(3)),high polarization intensity(i.e.,40μC/cm^(2)),simple preparation process,and relatively low raw material cost.Developing NN-based relaxor antiferroelectric ceramics with superior comprehensive energy storage properties is still a challenge because of the contradiction between polarization and breakdown strength.Therefore,exploring a relationship between the structure and energy storage properties of NN-based relaxor antiferroelectric ceramics is still a research aspect for NN-based ceramics.In this paper,a strategy of reducing tolerance factor was adopted to stabilize the antiferroelectric phase of NN-based ceramics.10%(in mole fraction)BiFeO_(3)(BF)with a low tolerance factor(i.e.,0.9543)was incorporated into pure NN as a second end member

关 键 词：铌酸钠 无铅陶瓷 反铁电 储能特性 充放电特性 

分 类 号：TQ174.75[化学工程—陶瓷工业]