论文标题
弯曲的独立式钙钛矿氧化物中的巨大极化和异常弯曲变形
Giant Polarization and Abnormal Flexural Deformation in Bent Freestanding Perovskite Oxides
论文作者
论文摘要
最近对超薄独立式钙钛矿氧化物的实现为探测二维氧化物中新型特性提供了独特的平台。在这里，我们观察到在弯曲状态下，由高达4x10E7/m产生的弯曲状态的独立式BifeO3和SRTIO3中的巨型挠性反应，这表明实现极高的极化的有希望的方法。此外，在弯曲的独立bifeo3中发现了厚度的实质性可逆变化，这意味着在这种铁电膜中，在这种铁电膜上的比例异常的弯曲/收缩/收缩和厚度依赖性泊松的比例，这在晶体材料中从未见过。我们的理论建模表明，膜内的这种前所未有的弯曲变形归因于柔韧性 - 彼索电的相互作用。该发现揭示了吸引人的纳米级机电特性，并为其在柔性纳米机电系统中的实际应用提供了指导。
Recent realizations of ultrathin freestanding perovskite oxides offer a unique platform to probe novel properties in two-dimensional oxides. Here, we observed a giant flexoelectric response in freestanding BiFeO3 and SrTiO3 in their bent state arising from strain gradients up to 4x10e7/m, suggesting a promising approach for realizing extremely large polarizations. Additionally, a substantial reversible change in thickness was discovered in bent freestanding BiFeO3, which implies an unusual bending-expansion/shrinkage and thickness-dependence Poisson's ratios in this ferroelectric membrane that has never been seen before in crystalline materials. Our theoretical modeling reveals that this unprecedented flexural deformation within the membrane is attributable to a flexoelectricity-piezoelectricity interplay. The finding unveils intriguing nanoscale electromechanical properties and provides guidance for their practical applications in flexible nanoelectromechanical systems.
