稀土掺杂对铌酸钠基陶瓷介电及储能性能的影响  

Effect of Rare-Earth Doping on Dielectric and Energy Storage Performance of Sodium Niobate-Based Ceramics

作　　者：王传民 张海波[1,3] 郭新 肖建中 张晓东[1,3] 张顺平 谢兵 谭划[1,3] WANG Chuanmin;ZHANG Haibo;GUO Xin;XIAO Jianzhong;ZHANG Xiaodong;ZHANG Shunping;XIE Bing;TAN Hua(State Key Laboratory of Materials Processing and Die&Mould Technology,School of Materials Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;School of Materials Science and Engineering,Nanchang Hangkong University,Nanchang,330063,China;Guangdong HUST Industrial Technology Research Institute,Dongguan 523808,Guangdong,China)

机构地区：[1]华中科技大学材料科学与工程学院,材料成形与模具技术国家重点实验室,武汉430074 [2]南昌航空大学材料科学与工程学院,南昌330063 [3]广东华中科技大学工业技术研究院,广东东莞523808

出　　处：《硅酸盐学报》2024年第4期1240-1249,共10页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金青年科学基金(52202133);广东省基础与应用基础研究基金(2023A1515010373);光谷实验室创新项目(OVL2023ZD001);东莞市引进创新科研团队计划(2020607101007);国家自然科学基金面上项目(52372109)。

摘　　要：随着对电子器件高度集成化、小型化的需求,电介质陶瓷逐渐成为脉冲电力电子系统中关键材料之一。其中,具有大的最大极化、小的剩余极化以及低的介电损耗的反铁电储能陶瓷逐渐成为最佳的储能陶瓷材料。采用固相反应法制备了Sm^(3+)掺杂的0.9NaNbO_(3)-0.1BiFeO_(3)(NN-BF)基弛豫反铁电陶瓷,化学式为(1–x)[0.9NaNbO_(3)-0.1BiFeO_(3)]-xSm_(2)O_(3)(x=0.01,0.02,0.03,0.04),系统地探究了Sm^(3+)掺杂对NN-BF基储能陶瓷物相结构、微观形貌、介电性能及储能性能的影响。结果表明:随着Sm^(3+)掺杂量的增加,储能陶瓷的晶粒尺寸和剩余极化均呈现先减小后增大的趋势,而击穿场强、最大极化、储能密度及储能效率均呈现先增大后减小的趋势。此外,由于Sm元素价态不稳定,适量掺杂Sm^(3+)可以稳定Fe^(3+)的价态,使NN-BF的反铁电相更加稳定。当Sm^(3+)的掺杂量为x=0.02时,NN-BF陶瓷反铁电相的稳定性以及铁电相的弛豫性均得到了增强,此时击穿场强达到438 KV/cm,室温下储能密度及储能效率分别为3.67 J/cm^(3)及71.63%,呈现较好的储能性能。Introduction The common energy storage devices mainly include supercapacitors,lithium-ion batteries,fuel cells,and ceramic capacitors.Compared to other energy storage devices,ceramic capacitors have attracted much attention due to their ultra-high charge-discharge rates and power density.Antiferroelectric ceramics exhibit a large maximum polarization and close-to-zero residual polarization,displaying characteristics of a double hysteresis loop.Also,antiferroelectric ceramics have an advantage of low dielectric loss,making them one of the optimal energy storage materials.Lead-free NaNbO_(3)-based antiferroelectric ceramics become popular due to the environmental concern and cost reduction.However,NaNbO_(3)-based ceramics can transform from an antiferroelectric phase to a ferroelectric phase at a certain applied electric field.Even after removing the applied electric field,some ferroelectric phase remains,increasing the residual polarization strength and affecting the formation of the double hysteresis loop at room temperature.Furthermore,a transition between antiferroelectric phase and ferroelectric phase caused by the complex phase structure results in a loss of most energy in the form of heat,reducing the energy storage efficiency(η).To further regulate the energy storage characteristics of NN-based antiferroelectric ceramics,this paper introduced Bi^(3+)and Fe^(3+)into the NaNbO_(3) matrix to enhance the stability of the antiferroelectric phase and the relaxor behavior of the ferroelectric phase,resulting in a relaxor antiferroelectric ceramic.Different molar fractions of Sm_(2)O_(3) were doped into the NN-BF ceramics with Sm^(3+)solid solution into the NaNbO_(3) lattice.In addition,the influence of doping amount of Sm^(3+)on the phase structure,microstructure,dielectric properties,and energy storage performance of NN-BF ceramics was also investigated.Methods Different Sm^(3+)doping amounts of(1–x)[0.9NaNbO_(3)-0.1BiFeO_(3)]-xSm_(2)O_(3)(x=0.01,0.02,0.03,0.04)relaxor antiferroelectric ceramics were prepared

关 键 词：稀土掺杂 反铁电陶瓷 击穿场强 储能密度 

分 类 号：TQ174[化学工程—陶瓷工业]