论文标题
筛选压电性在确定纳米级的挠性系数时
Screening piezoelectricity in determination of flexoelectric coefficient at nanoscale
论文作者
论文摘要
压电性通常在极性材料中具有柔韧性，这是极化对应变梯度的线性响应。因此，在确定纯挠性反应时，很难消除压电效应。在这项工作中，我们提出了一种分析方法，以通过筛选压电性来定量在压电材料中定量地表征挠性系数。我们的结果表明，柔韧性降低了纳米刚度，而压电会增强它。通过仔细设计纳米柱的形状并测量其刚度差，可以完全消除压电贡献，从而获得挠性系数。这种方法避免了具有动态载荷的电特性的测量，这有助于减少纳米级挠性测量的挑战。我们的工作将有助于对纳米级的挠性特性的定量表征和挠性设备的设计。
Piezoelectricity usually accompanies with flexoelectricity in polar materials which is the linear response of polarization to a strain gradient. Therefore, it is hard to eliminate piezoelectric effect in determination of pure flexoelectric response. In this work, we propose an analytical method to characterize the flexoelectric coefficient quantitatively at nanoscale in piezoelectric materials by screening piezoelectricity. Our results show that the flexoelectricity reduces the nanopillar stiffness while the piezoelectricity enhances it. With careful design of the shape of the nanopillars and measuring their stiffness difference, the flexoelectric coefficient can be obtained with the piezoelectric contribution eliminated completely. This approach avoids the measurement of electrical properties with dynamic load, which helps to reduce the challenge of flexoelectric measurement at nanoscale. Our work will be beneficial to quantitative characterization of flexoelectric properties and design of flexoelectric devices at nanoscale.
