About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
|
Computational Discovery and Design of Materials
|
Presentation Title |
Interactions between Oxygen Vacancies and Polarons in Perovskite Oxides |
Author(s) |
Dylan Windsor, Haixuan Xu |
On-Site Speaker (Planned) |
Dylan Windsor |
Abstract Scope |
Oxygen vacancies are ubiquitous in perovskite oxides and have been shown to affect significant changes in the properties emergent from the highly confined and correlated oxygen octahedra. Of vital importance for materials discovery and design is advancing the fundamental understanding of charge localization and interaction with oxygen vacancies. Here results of studying PbTiO3 using density functional theory (DFT) demonstrate oxygen vacancies serve as trapping sites for electron polarons in the material, influencing the formation energy, local ionic displacements, and electronic structure of vacancies. We investigate these changes by thorough analysis of the local ionic displacements, band structure, and defect charge transfer levels of oxygen vacancies in the +2, +1, and neutral charge states. Furthermore, a comparison is made between the behavior of oxygen vacancies as studied using standard DFT, DFT+U without considering the polaron, and DFT+U considering polaron effects to show the necessity of polaron consideration in vacancy modelling. |
Proceedings Inclusion? |
Planned: |
Keywords |
Computational Materials Science & Engineering, Modeling and Simulation, Other |