期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 722, 期 -, 页码 676-682出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2017.06.177
关键词
Ceramic; Colossal permittivity; Rutile TiO2; Dielectric
资金
- National Science Foundation of China [51572162]
- Fundamental Research Funds for the Central Universities [2016TS036]
The (Bi0.5Nb0.5)(x)Ti1-xO2 (BNTO, 0 <= x <= 0.05) ceramics were synthesized by a standard conventional solid-state reaction. The effects of sintering temperature and composition x on the crystal structure, microstructure, and dielectric properties of BNTO ceramics were investigated. A pure rutile phase is achieved as x <= 0.01, and secondary phase Bi1.74Ti2O6.624 is detected as x >= 0.025. BNTO ceramic with x = 0.025 shows a high dielectric constant (155.1 k) and low dielectric loss (0.042) at 1 kHz (room temperature). Colossal permittivity is primarily related to Maxwell-Wagner effect, electron-pinned defect-dipoles or weak-binding electron. The low dielectric loss is argued to Bi ions which are doped into TiO2 lattice and the formation of Bi1.74Ti2O6.624 phase. (C) 2017 Elsevier B.V. All rights reserved.
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