High-dielectric-constant nanograin BaTiO_(3)-based ceramics for ultra-thin layer multilayer ceramic capacitors via grain grading engineering  

作　　者：Chaoqiong Zhu Ziming Cai Xiuhua Cao Zhenxiao Fu Longtu Li Xiaohui Wang 

机构地区：[1]State Key Laboratory of New Ceramics and Fine Processing,School of Materials Science and Engineering,Tsinghua University,Beijing 100084,China [2]School of Materials Science and Physics,China University of Mining and Technology,Xuzhou 221116,China [3]State Key Laboratory of Advanced Materials and Electronic Components,Guangdong Fenghua Advanced Technology Holding Co.,Ltd,Zhaoqing,Guangdong 526000,China

出　　处：《Advanced Powder Materials》2022年第3期63-69,共7页先进粉体材料（英文）

基　　金：supported by Ministry of Science and Technology of China through The Key Area Research Plan of Guangdong(Grant No.2019B010937001);High-end MLCC Key Project supported by Guangdong Fenghua Advanced Technology Holding Co.,Ltd.(No.20212001429);the National Key Research and Development Program of China(No.2017YFB0406302);the National Natural Science Foundation of China(No.52032005).

摘　　要：Four BT-based ceramic samples were prepared using a grain grading approach.The bigger-grained(~100 nm)and smaller-grained(~70 nm)BaTiO_(3)(BT)powders were mixed.The smaller-grained BT powder controlled the average grain size and guaranteed the reliability,while the bigger-grained powder enhanced the dielectric constant.Various percentages of bigger-grained BT powder were introduced to balance the average grain size and the dielectric constant.As the proportion of bigger grains increased,the dielectric constant(εr)improved significantly.The room-temperatureεr of 25%bigger-grain mixed BT(2623)was~50%higher than that of the sample with a similar average grain size without grain grading.The ceramic mixed with 15%bigger-grained BT showed comprehensive dielectric performance,which met the EIA X5R standard and provided a considerableεr of 1841 along with a low dielectric loss of 0.78%.Notably,the average grain size was 90 nm,which favors the applications in ultra-thin multilayer ceramic capacitors.

关 键 词：Grain grading engineering Nanograin BaTiO_(3) Dielectric constant Reliability Multilayer ceramic capacitors 

分 类 号：TQ1[化学工程]