材料科学与工程学报2017，Vol.35Issue(5)：695-699,800,6.DOI:10.14136/j.cnki.issn 1673-2812.2017.05.002
SrTiO3/CaCu3Ti4O12复合陶瓷材料的介电性能
Dielectric Properties of SrTiO3/CaCu3Ti4O12 Composite Ceramics
摘要
Abstract
xSrTiO3/(1-x)CaCu3Ti4O12 (x=0,0.2,0.4,0.6,0.8,1) composites were prepared by solid-state reaction process.The phase structure,microstructure,dielectric properties of the composites were investigated.The results exhibit that the dense composites can be sintered at the temperature range from 1348 to 1600 K.The dielectric constant of the samples decreases from 71358 (x=0) to 270 (x=0) with increasing content of SrTiO3 at room temperature and 100 kHz,which follows Lichtenecker's logarithmic law of composites.The dielectric loss first increased and then suppressed with the SrTiO3 increase.The dielectric properties of 0.2SrTiO3/0.8CaCu3Ti4O12 composites are quite similar to CaCu3Ti4O12 ceramics with the lowtemperature dielectric relaxation and giant dielectric constant step.With increasing content of SrTiO3,the lowtemperature dielectric relaxation is depressed and the high-temperature dielectric relaxation is enhanced.The former may be due to the increase of activation energy for low-temperature dielectric relaxation,while the latter by the effect of high temperature conductivity.Therefore,the distinctive giant dielectric constant steps of CaCu3 Ti4O12 ceramics are wearing off with increasing SrTiO3 content.The temperature dependences of SrTiO3 /CaCu3Ti4O12 composites are thus enhanced.关键词
SrTiO3/CaCu3Ti4O12/介电常数/介电弛豫Key words
SrTiO3/CaCu3Ti4O12/dielectric constant/dielectric relaxation分类
信息技术与安全科学引用本文复制引用
倪磊,任新苗,阮坤,曾祥天,刘颖,王烁..SrTiO3/CaCu3Ti4O12复合陶瓷材料的介电性能[J].材料科学与工程学报,2017,35(5):695-699,800,6.基金项目
国家自然科学基金资助项目(51501017) （51501017）
西北工业大学凝固国家重点实验室开放基金资助项目(2014031140419) （2014031140419）
国家大学生创新创业训练计划资助项目(201510710085) （201510710085）
