Abstract Dislocations in ferroelectrics play important roles in ferroelectricity, piezoelectricity, and dielectricity. However, the intrinsic charge-lattice coupling mechanism in ferroelectric crystals containing dislocations is still not well understood. Here, we report a large local polarization inhomogeneity of ~100 μCcm−2 induced by a single a[001] dislocation in the PbZr0.2Ti0.8O3/SrTiO3 film/substrate heterostructure, the tensile region (~120 μCcm−2) and the compressive strain region (~21 μCcm−2) around the dislocation forms a butterfly-like area. This study reveals the dramatic effects of dislocations on local polarization and provides a strategy to manipulate the polarization magnitude and orientation of local polarization by defect engineering.

中文翻译：

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位错引起的铁电材料大局部极化不均匀性

摘要 铁电体中的位错在铁电性、压电性和介电性中起着重要作用。然而，包含位错的铁电晶体中的固有电荷-晶格耦合机制仍不清楚。在这里，我们报告了由 PbZr0.2Ti0.8O3/SrTiO3 膜/衬底异质结构中的单个 a[001] 位错引起的 ~100 μCcm-2 的大局部极化不均匀性、拉伸区域 (~120 μCcm-2) 和位错周围的压缩应变区 (~21 μCcm-2) 形成蝴蝶状区域。这项研究揭示了位错对局部极化的显着影响，并提供了一种通过缺陷工程操纵局部极化的极化强度和方向的策略。