Enhanced Piezoelectric Response at Nanoscale Vortex Structures in Ferroelectrics

Xiaowen Shi, Nimish Prashant Nazirkar, Ravi Kashikar, Dmitry Karpov, Shola Folarin, Zachary Barringer, Skye Williams, Boris Kiefer, Ross Harder, Wonsuk Cha, Ruihao Yuan, Zhen Liu, Dezhen Xue, Turab Lookman, Inna Ponomareva, Edwin Fohtung

科研成果: 期刊稿件文章同行评审

1 引用 (Scopus)

摘要

The piezoelectric response is a measure of the sensitivity of a material’s polarization to stress or its strain to an applied field. Using in operando X-ray Bragg coherent diffraction imaging, we observe that topological vortices are the source of a 5-fold enhancement of the piezoelectric response near the vortex core. The vortices form where several low-symmetry ferroelectric phases and phase boundaries coalesce. Unlike bulk ferroelectric solid solutions in which a large piezoelectric response is associated with coexisting phases in the proximity of the triple point, the largest responses for pure BaTiO3 at the nanoscale are in spatial regions of extremely small spontaneous polarization at vortex cores. The response decays inversely with polarization away from the vortex, analogous to the behavior in bulk ceramics as the cation compositions are varied away from the triple point. We use first-principles-based molecular dynamics to augment our observations, and our results suggest that nanoscale piezoelectric materials with a large piezoelectric response can be designed within a parameter space governed by vortex cores. Our findings have implications for the development of next-generation nanoscale piezoelectric materials.

源语言英语
页(从-至)7522-7530
页数9
期刊ACS Applied Materials and Interfaces
16
6
DOI
出版状态已出版 - 14 2月 2024
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