Colossal permittivity and ultralow dielectric loss in Nb-doped SrTiO_(3) ceramics  

作　　者：Jinghan Cai Junlei Qi Yueyang Yang Xinyue Zhang Yuan-Hua Lin 

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

出　　处：《Journal of Advanced Ceramics》2023年第12期2247-2256,共10页先进陶瓷（英文）

基　　金：This work was supported by the National Key R&D Program of China(Grant No.2021YFB3800601);the Basic Science Center Project of the National Natural Science Foundation of China(Grant No.52388201).

摘　　要：Defect engineering has been applied to prepare materials with modifiable dielectric properties.SrTiNbxO3(x=0,0.003,0.006,0.009,0.012)ceramics were synthesized using the traditional solid-state reaction method and sintered in a reducing atmosphere.All samples show excellent dielectric properties with giant permittivity(>3.5×10^(4))and low dielectric loss(<0.01).SrTiNb0.003O3 ceramic exhibits a colossal permittivity of 4.6×10^(4)and an ultralow dielectric loss of 0.005(1 kHz,room temperature)as well as great temperature stability in the range of(−60)–160℃.The mechanism of the presented colossal permittivity(CP)properties is investigated by conducting X-ray photoelectron spectroscopy(XPS)and analyzing activation energies.The results indicate that the introduction of Nb5+and the reducing sintering atmosphere together generated the formation of Ti^(3+)and V_(O)^(**).These defects further form Ti-V_(O)^(**)-Ti'_(Ti)defect dipoles,contributing to the coexisting giant permittivity and low dielectric loss in Nb-doped SrTiO_(3)(STN)ceramics.

关 键 词：SrTiO_(3) colossal permittivity(CP) ultralow dielectric loss defect dipoles 

分 类 号：TQ174.7[化学工程—陶瓷工业] TM53[化学工程—硅酸盐工业]