A ferroelectric polarization contribution from defect dipoles in acceptor Aurivillius oxide, (Na,Bi)0.47(Li,Ce)0.03Bi 2Ta1.97Sc0.03O8.97

Changbai Long, Huiqing Fan, Mengmeng Li

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Abstract

Double-loop-like characteristic was detected in acceptor Aurivillius ceramic, (Na,Bi)0.47(Li,Ce)0.03Bi2Ta 1.97Sc0.03O8.97 (NBTO-LiCeSc-0.03) due to the restoring force provided by defect polarization (PD). The P D was associated with non-centric distributing defect dipoles [(ScTa″-VO••) ×], which was verified by impedance spectroscopy measures. Interestingly, the PD 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 O2 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., (ScTa″-OO)′].

Original languageEnglish
Article number192908
JournalApplied Physics Letters
Volume103
Issue number19
DOIs
StatePublished - 4 Nov 2013

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