Thermodynamic stabilization and electronic effects of oxygen vacancies at BiFeO$_3$ neutral ferroelectric domain walls
Fuente:
arXiv
Saved in:
| Main Authors: | , , |
|---|---|
| Format: | Preprint |
| Published: |
2025
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866912484918558720 |
|---|---|
| author | Zhao, Guo-Dong Dabo, Ismaila Chen, Long-Qing |
| author_facet | Zhao, Guo-Dong Dabo, Ismaila Chen, Long-Qing |
| contents | Enhanced conductivity at ferroelectric domain walls in BiFeO$_3$ has been widely observed, yet the microscopic origins of this effect, including electronic contributions from domain-wall defects, are incompletely understood at the atomistic level. Here, we carry out first-principles simulations to quantify the thermodynamic stability and electronic impact of oxygen vacancies at charge-neutral 71$^\circ$, 109$^\circ$, and 180$^\circ$ domain walls of BiFeO$_3$. We find that vacancies are energetically favored at domain walls by up to 0.3 eV compared to the bulk, leading to orders-of-magnitude increase in vacancy equilibrium concentration. The corresponding formation energy landscapes are discontinued and explained by local bond weakening. The vacancies induce localized electronic intragap states corresponding to small polarons, which promote thermally activated n-type conduction in the low-current regime, and their tendency to aggregate facilitate Schottky emission in the high-current regime. Our results provide a quantitative foundation for interpreting domain-wall conduction, offer guidance for defect engineering in ferroelectrics, and provide important information to phase-field simulations of defect-domain wall interactions in a ferroelectric domain structure. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_11863 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Thermodynamic stabilization and electronic effects of oxygen vacancies at BiFeO$_3$ neutral ferroelectric domain walls Zhao, Guo-Dong Dabo, Ismaila Chen, Long-Qing Materials Science Enhanced conductivity at ferroelectric domain walls in BiFeO$_3$ has been widely observed, yet the microscopic origins of this effect, including electronic contributions from domain-wall defects, are incompletely understood at the atomistic level. Here, we carry out first-principles simulations to quantify the thermodynamic stability and electronic impact of oxygen vacancies at charge-neutral 71$^\circ$, 109$^\circ$, and 180$^\circ$ domain walls of BiFeO$_3$. We find that vacancies are energetically favored at domain walls by up to 0.3 eV compared to the bulk, leading to orders-of-magnitude increase in vacancy equilibrium concentration. The corresponding formation energy landscapes are discontinued and explained by local bond weakening. The vacancies induce localized electronic intragap states corresponding to small polarons, which promote thermally activated n-type conduction in the low-current regime, and their tendency to aggregate facilitate Schottky emission in the high-current regime. Our results provide a quantitative foundation for interpreting domain-wall conduction, offer guidance for defect engineering in ferroelectrics, and provide important information to phase-field simulations of defect-domain wall interactions in a ferroelectric domain structure. |
| title | Thermodynamic stabilization and electronic effects of oxygen vacancies at BiFeO$_3$ neutral ferroelectric domain walls |
| topic | Materials Science |
| url | https://arxiv.org/abs/2507.11863 |