具有“芯-壳”及纳米畴结构的X9R型钛酸钡基陶瓷介电性能研究  

Design of High-Performance BaTiO_(3)-Based X9R Ceramics by Forming a Core-Shell Structure and Nano-Domains

作　　者：厉琨 张蕾 郭瑞 于淑会[1] 曹秀华 付振晓 孙蓉[1] LI Kun;ZHANG Le;GUO Rui;YU Shuhui;CAO Xiuhua;FU Zhenxiao;SUN Rong(Shenzhen Institute of Advanced Technology,Chinese Academy of Sciences,Shenzhen 518055,China;University of Chinese Academy of Sciences,Beijing 100049,China;Academy for Advanced Interdisciplinary Studies,Southern University of Science and Technology,Shenzhen 518055,China;State Key Laboratory of Advanced Materials and Electronic Components,Guangdong Fenghua Advanced Technology Holding Co.,Lid.,Zhaoqing 526060,China)

机构地区：[1]中国科学院深圳先进技术研究院,深圳518055 [2]中国科学院大学,北京100049 [3]南方科技大学前沿与交叉科学研究院,深圳518055 [4]广东风华高新科技股份有限公司新型电子元器件关键材料与工艺国家重点实验室,肇庆526060

出　　处：《集成技术》2022年第2期79-88,共10页Journal of Integration Technology

基　　金：国家自然科学基金项目(51802142);新型电子元器件关键材料与工艺国家重点实验室项目(FHR-JS-202011012,FHR-JS-202011013,FHRJS-202011014);先进电子元器件联合创新中心项目(FHR-JS-202103001)。

摘　　要：高容高温是下一代片式多层陶瓷电容器的重要发展方向,因此,开发具有高容高温特性的X9R型钛酸钡基介质材料,对于促进高容高温多层陶瓷电容器的发展具有重要意义。该研究以钛酸钡(BaTiO_(3),BT)为原料,利用传统固相反应烧结法,并通过调节钛酸铋钠(Bi_(1/2)Na_(1/2)TiO_(3),BNT)的基体固溶量和稀土元素铌(Nb)的掺杂量,成功制备出具有较高室温介电常数和较宽容温特性的Nb掺杂BT-BNT介质体系。在此基础上,对X9R型介质材料纳米畴及“芯-壳”结构与介温特性之间的关系进行了研究。实验结果表明,当BNT固溶量为10 mol%,BT-BNT的居里温度为190℃,晶粒具有典型的90°铁电畴;在0.9BT-0.1BNT固溶体中掺杂2.0 mol%的Nb元素,介电常数为1800,损耗<2.0%,容温系数(-55~200℃)≤15%,晶粒形成明显的“芯-壳”结构,其中“芯”部具有小尺寸的纳米尺度铁电纳米畴,“壳”部为Nb均匀分布的BT-BNT固溶体。因此,0.9BT-0.1BNT-2.0Nb陶瓷是一种极具前景的X9R型多层陶瓷电容器用电介质材料。As a key and foundational component for modern electronic devices,the multilayer ceramic capacitors with excellent temperature stability are desirable for the next generation of high-temperature capacitors.Herein,authors fabricated Nd-doped BaTiO_(3)-(Bi_(1/2)Na_(1/2))TiO_(3) dielectric ceramics with Electronic Industries Association specification of X9 R by solid-state reaction process.It is shown that the 0.9 BT-0.1 BNT exhibits a homogeneous solid solution with the ferroelectric domain structure.With an increase in the Nd concentration and temperature,the tetragonality decreases while the peak of dielectric permittivity curve becomes more broaden and stable.In particular,Nb-doped 0.9 BT-0.1 BNT samples imply a typical core-shell structure with nano-sized domain in the core to increase the dielectric constant.In addition,0.9 BT-0.1 BNT-2.0 Nb ceramic demonstrates the dielectric constant of 1800 and dielectric loss of 2.0%from-55℃to 200℃.This work not only provides a promising candidate material,but also provides an attractive method to design new family of high-performance dielectric ceramics for high temperature MLCCs applications.

关 键 词：BT-BNT 介电性能 “芯-壳”结构 纳米畴 X9R-MLCC陶瓷 

分 类 号：TQ174[化学工程—陶瓷工业]