期刊
APPLIED PHYSICS LETTERS
卷 117, 期 3, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/5.0007189
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资金
- National Natural Science Foundation of China [51502346, 51332003, 51672220, 11974268]
- Natural Science Foundation of Shaanxi [2020JM-207]
- China Postdoctoral Science Foundation [2017M623165, 2019T120904]
- Shaanxi Province Postdoctoral Science Foundation [2018BSHEDZZ117]
- Fundamental Research Funds for the Central Universities [XJS201402]
- Natural Science Foundation of Guangxi [AA138162, GA245006, FA198015, AA294014]
- High Level Innovation Team and Outstanding Scholar Program of Guangxi Institutes
A synergetic effect of Li/Nd at the A site and W/Mn at the B site co-substitution on electrical properties of calcium bismuth niobate (CaBi2Nb2O9, CBNO)-based ceramics is proposed in this paper. CBNO primarily shows mixed p-type and ionic conduction due to a trace of oxygen vacancies (V-O(center dot center dot)). Both bulk resistivity (rho (b)) and activity energy (E-a) for conduction are dramatically increased by the co-substitution in Ca-0.92(Li1/2Nd1/2)(0.08)Bi2Nb2-x(W3/4Mn1/4)(x)O-9 [CBNO-LN-x(WM), x=0-0.02]. Consequently, the modified compositions almost show an intrinsic conducting mechanism due to a significant suppression of the V-O(center dot center dot) concentration. Furthermore, the synergetic effect of Li/Nd at the A site and W/Mn at the B site greatly improves the piezoelectricity coefficient (d(33)), which is up to similar to 21.1 pC/N in the optimized composition [CBNO-LN-10(WM)]. This combined with a high Curie temperature (T-C=similar to 946 degrees C) and high resistivity indicates that CBNO-LN-10(WM) is a good promising material in high-temperature piezoelectric applications.
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