期刊
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
卷 44, 期 -, 页码 54-61出版社
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2019.11.012
关键词
Bi doped SrTiO3; Sr deficiency; Colossal permittivity; Low dielectric loss
资金
- National Natural Science Foundation of China [51677033, 51802061, 51702069]
Bi doped SrTiO3 ceramics with Sr deficiency, i.e. Sr1-1.5xBixTiO3 (x=0, 0.01, 0.05, 0.1), were prepared via conventional solid-state reaction route. A colossal permittivity (CP) over 104 with low dielectric loss less than 0.05 was obtained in x=0.05 Sr1-1.5xBixTiO3 ceramics. In addition, the dielectric constant is maintained at a value greater than 104 in the range of 10(2)-10(5) Hz and almost frequency independent. Phase structure analysis and density functional theory calculations suggest that the Bi-Sr(center dot) - V-Sr '' (-) Bi-Sr(center dot) defect complex with hole-pinned defect-dipoles maybe responsible for the high-performance CP properties. This work gives a new way to achieve high performance CP materials in ABO(3) perovskite ceramics. (C) 2020 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
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