Domain disruption and defect accumulation during unipolar electric fatigue in a BZT-BCT ceramic
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Abstract
0.5Ba(Zr0.2Ti0.8)O30.5(Ba0.7Ca0.3)TiO3 (BZT-BCT) is a promising lead-free piezoelectric ceramic with excellent piezoelectric properties (e.g., d33 > 600 pC/N). As potential device applications are considered, the electric fatigue resistance of the ceramic must be evaluated. In this Letter, electric-field in situ transmission electron microscopy is employed to study the microstructural evolution in the BZT-BCT polycrystalline ceramic during unipolar cycling. It is shown that the large ferroelectric domains are disrupted and replaced with accumulated defect clusters and fragmented domains after 5 × 104 unipolar cycles. In this fatigued state, the grain becomes nonresponsive to applied voltages.
Comments
This article is published as Fan, Zhongming, Chao Zhou, Xiaobing Ren, and Xiaoli Tan. "Domain disruption and defect accumulation during unipolar electric fatigue in a BZT-BCT ceramic." Applied Physics Letters 111, no. 25 (2017): 252902. doi: 10.1063/1.5008619. Posted with permission.