华东理工大学学报（自然科学版）2017，Vol.43Issue(6)：800-805,6.DOI:10.14135/j.cnki.1006-3080.2017.06.008
Nb2O5掺杂对SrTiO3陶瓷显微结构和微波介电损耗的影响
Effect of Nb2O5 Doping on Microstructures and Microwave Dielectric Loss of SrTiO3 Ceramics
韩蕊 1李蔚 1汪霖 2严嵩1
作者信息
- 1. 华东理工大学材料科学与工程学院,上海200237
- 2. 昆山特乃博先进材料技术有限公司,江苏昆山215321
- 折叠
摘要
Abstract
Nb-doped SrTiO3 ceramics were prepared via sintering without extra pressure.Effects of Nb2O5 contents on the phase composition,microstructures and microwave dielectric loss of SrTiO3 ceramics were investigated.Results showed that Nb2O5 doping has no evident impact on phase composition but hinders the densification and promotes the grain growth of samples to some extent.Upon increasing the amount of Nb2O5 doping,the permittivity (εr) of SrTiO3 ceramics decreased from 296 to 230 and the temperature coefficient reduced from 1.714)× 10-3 to 1.629 × 10 3℃-1 gradually,while the Q× f value increased sharply at first and then decreases slowly.When 0.15 ％ (mass fraction) Nb2O5 were doped,the dielectric loss of SrTiO3 ceramics was the lowest,and the Q× f reached 6 281 G Hz (the dielectric constant was about 270 and the temperature coefficient 1.684× 10-3C-1),which is about 5.5 times as high as that of the un doped samples (1 145 GHz).The reasons for the changes of microstructures,dielectric constants,temperature coefficients especially the dielectric loss were also discussed.关键词
钛酸锶/Nb2O5掺杂/显微结构/微波介电损耗Key words
SrTiO3/Nb2O5 doping/microstructures/microwave dielectric loss分类
化学化工引用本文复制引用
韩蕊,李蔚,汪霖,严嵩..Nb2O5掺杂对SrTiO3陶瓷显微结构和微波介电损耗的影响[J].华东理工大学学报（自然科学版）,2017,43(6):800-805,6.
