High recoverable energy density of Na_(0.5)Bi_(0.5)TiO_(3)-based ceramics by multi-scale insulation regulation and relaxor optimization strategy  

作　　者：Qiuyu Zheng Bing Xie Yahui Tian Qi Wang Huajie Luo Zhiyong Liu Haibo Zhang 

机构地区：[1]School of Materials Science and Engineering,Nanchang Hangkong University,Nanchang,330063,China [2]School of Information Engineering,Jiangxi University of Technology,Nanchang,Jiangxi,330098,China [3]Beijing Advanced Innovation Center for Materials Genome Engineering,University of Science and Technology Beijing,Beijing,100083,China [4]School of Materials Science and Engineering,Huazhong University of Science and Technology,Wuhan,430074,China

出　　处：《Journal of Materiomics》2024年第4期845-856,共12页无机材料学学报（英文）

基　　金：This work is supported by the National Natural Science Foundation of China(Grant No.52162018,52162017);the Natural Science Foundation of Jiangxi Province of China(Grant No.20224ACB214007);the Innovation Special Foundation for Graduate Students of Nanchang Hangkong University(Grant No.YC2022-009).

摘　　要：Dielectric ceramic capacitors(DCCs)are highly desired for advanced electronic and electrical power systems owing to their ultrahigh power densities and fast charge-discharge speed.However,the low recoverable energy density(Wrec)of dielectric ceramic resulting from the low Weibull breakdown strength(Eb)has been a long-standing challenge.Here,we fabricated 0.8Na_(0.5)Bi_(0.5)TiO_(3)–0.2Sm_(1/3)Sr_(1/2)(Mg_(1/3)Nb_(2/3))O_(3)(0.8NBT–0.2SSMN)relaxor ferroelectric(RFE)ceramics display a greatly improved Eb of 480 kV/cm and largely enhanced Wrec of 7.3 J/cm^(3),far outperforming pure NBT ceramic.We demonstrate that the proposed multi-scale insulation regulation strategy via introducing SSMN with optimal content can effectively reduce grain sizes,increase the bandgap,and create a highly insulating second phase,leading to a high Eb.Additionally,the introduction of Sm^(3+)and Mg^(2+)–Nb^(5+) dopants on the A/B-sites of the Na_(0.5)Bi_(0.5)TiO_(3) lattice created disruptions in the long-range-ordered ferroelectric domains,leading to excellent RFE property.The high Eb and excellent RFE property led to the substantial improvement of Wrec.Else,an exceptional thermal stability of Wrec and efficiency(η)are obtained at 25–200℃(W_(rec∼)(1.77±0.08)J/cm^(3),η∼82.9%±4.3%).This work offers a route for designing high energy storage performance relaxor ferroelectric ceramics for high-voltage dielectric ceramic capacitors.

关 键 词：Multi-scale insulation regulation Relaxor ferroelectrics Energy storage performance Thermal stability 

分 类 号：TQ174.1[化学工程—陶瓷工业]