Dislocation-induced large local polarization inhomogeneity of ferroelectric materials

Ning Li, Ruixue Zhu, Xiaoxing Cheng, Heng Jui Liu, Zhangyuan Zhang, Yen Lin Huang, Ying Hao Chu, Long Qing Chen, Yuichi Ikuhara, Peng Gao*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish
Article number113624
JournalScripta Materialia
Volume194
DOIs
StatePublished - 15 Mar 2021

Keywords

  • Dislocations
  • ferroelectricity
  • polarization inhomogeneity
  • PZT/STO
  • STEM

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