期刊
APPLIED PHYSICS LETTERS
卷 103, 期 19, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4829267
关键词
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资金
- National Natural Science Foundation [51172187]
- SRPDF [0116102130002, 20116102120016]
- 111 Program of MOE [B08040]
- Xi'an Science and Technology Foundation [CX1261-2, CX1261-3, CX12174]
- Shaanxi Province Science Foundation [2013KW12-02]
- NPU Fundamental Research Foundation of China [NPU-FFR-JC201232]
- Excellent Doctorate Foundation of NPU
Double-loop-like characteristic was detected in acceptor Aurivillius ceramic, (Na,Bi)(0.47)(Li,Ce)(0.03) Bi2Ta1.97Sc0.03O8.97 (NBTO-LiCeSc-0.03) due to the restoring force provided by defect polarization (P-D). The PD was associated with non-centric distributing defect dipoles [(Sc-Ta ''-VO center dot center dot)(x)], which was verified by impedance spectroscopy measures. Interestingly, the P-D could be reoriented with high external electric field at very low frequency, which contributed to the significant enhancement of the polarization of NBTO-LiCeSc-0.03. Air or O-2 annealing led to the degradation of the polarization owing to high leakage current and the strong pinning effects of space charge and charged defect complexes [e.g., (Sc-Ta ''-O-O(center dot))']. (C) 2013 AIP Publishing LLC.
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