Domain disruption and defect accumulation during unipolar electric fatigue in a BZT-BCT ceramic
Domain disruption and defect accumulation during unipolar electric fatigue in a BZT-BCT ceramic
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DOI：
10.1063/1.5008619
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发表时间：
2017-12
影响因子：
4
通讯作者：
Z. Fan;Chao Zhou;X. Ren;X. Tan
中科院分区：
文献类型：
--
作者：
Z. Fan;Chao Zhou;X. Ren;X. Tan
0.5Ba（Zr0.2Ti0.8）O30.5（Ba0.7Ca0.3）TiO3（BZT-BCT）是一种具有优异压电性能（如，d33> 600 pC/N）。考虑到潜在的器件应用，必须评估陶瓷的抗电疲劳性。本文采用电场原位透射电子显微镜研究了BZT-BCT多晶陶瓷在单极循环过程中的微观结构演变。结果表明，经过5 × 104次单极循环后，大的铁电畴被破坏，并被累积的缺陷团簇和破碎的畴所取代。0.5Ba（Zr0.2Ti0.8）O30.5（Ba0.7Ca0.3）TiO3（BZT-BCT）是一种具有优异压电性能（例如，d33> 600 pC/N）。考虑到潜在的器件应用，必须评估陶瓷的抗电疲劳性。本文采用电场原位透射电子显微镜研究了BZT-BCT多晶陶瓷在单极循环过程中的微观结构演变。结果表明，经过5 × 104次单极循环后，大的铁电畴被破坏，并被累积的缺陷团簇和破碎的畴所取代。在这种疲劳状态下，晶粒变得对施加的电压无响应。
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.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.