Sr_(1-x)Er_(x)TiO_(3)陶瓷的巨介电性能研究  

Study on colossal permittivity properties of Sr_(1-x) Er_(x) TiO_(3) ceramics

作　　者：蒲永平[1] 张贤 张金波 宁亚婷 上阳超 PU Yong-ping;ZHANG Xian;ZHANG Jin-bo;NING Ya-ting;SHANG Yang-chao(School of Material Science and Engineering,Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials,Shaanxi University of Science&Technology,Xi′an 710021,China)

机构地区：[1]陕西科技大学材料科学与工程学院陕西省无机材料绿色制备与功能化重点实验室,陕西西安710021

出　　处：《陕西科技大学学报》2023年第4期104-111,共8页Journal of Shaanxi University of Science & Technology

基　　金：国家自然科学基金项目(52172118,51872175)。

摘　　要：选用“两性”稀土Er^(3+)离子掺杂SrTiO_(3)陶瓷,采用传统固相法制备出了在空气下烧结的具有巨介电低损耗的Sr_(1-x)Er_(x)TiO_(3)陶瓷.结果表明,当x=0.012,该陶瓷显示出巨介电行为,在1 kHz下具有17 790的介电常数,在1 MHz下具有14 363的介电常数,在1 kHz下具有0.02的介电损耗.在巨介电、低介电损耗的材料中,存在着“电子钉扎”现象,电子的局域极化使介电常数增大;而在此过程中,由于限制了电子的长程移动,从而降低了介质损耗.The Sr_(1-x) Er_(x) TiO_(3) ceramics were sintered in air with low dielectric loss and colossal permittivity,which were prepared by the traditional solid phase method by using amphoteric rare earth Er ^(3+)ions doped SrTiO_(3) ceramics.The results show that when x=0.012,the colossal permittivity is 17790 at 1 kHz,and the permittivity is 14363 at 1 MHz,dielectric loss is 0.02 at 1 kHz.In colossal permittivity materials with low dielectric loss,there is electron pinning effect,and the local polarization of electrons increases the permittivity.On the other hand,the long-range motion of electrons is inhibited,resulting in low dielectric loss.

关 键 词：SrTiO_(3) 巨介电常数 低介电损耗 两性掺杂 

分 类 号：TB32[一般工业技术—材料科学与工程]