期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 3, 期 22, 页码 5851-5858出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5tc00568j
关键词
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资金
- National Natural Science Foundation [51172187]
- SPDRF [20116102130002, 20116102120016]
- 111 Program of MOE [B08040]
- Xi'an Science and Technology Foundation [CX12174, XBCL-1-08]
- Shaanxi Province Science Foundation [2013KW12-02]
- SKLP Foundation [KP201421]
- Fundamental Research Funds for the Central Universities of China [3102014JGY01004]
New high temperature ceramic capacitors (K0.5Na0.5)((1-x))BixNb(1-2x/3)Cu2x/3O3 (x = 0-0.03) with Bi substitution for the A site and Cu substitution for the B site were synthesized using a solid state reaction process. Owing to its inhomogeneous microstructure and diffuse phase transition, (K0.5Na0.5)(0.985)Bi0.015Nb0.99Cu0.01O3 shows a stable permittivity (similar to 1350) over a broad temperature range (40-520 degrees C) and the capacitance variation is maintained smaller than +/- 15%, thereby paving the way for achieving high temperature capacitors in KNN based materials. Furthermore, the grain and grain boundary contributions to the capacitance have been separated using impedance spectroscopy, and the grain boundary effects show temperature independent capacitance, whereas grain effects show a capacitance maximum at the tetragonal to cubic phase transition.
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