Metastable oxygen vacancy ordering state and improved memristive behavior in TiO2 crystals

Tianyu Li, Fang Hong, Ke Yang, Binbin Yue, Nobumichi Tamura, Hua Wu, Zhenxiang Cheng, Chunchang Wang
2020 Science Bulletin  
Oxygen vacancy is one of the pivotal factors for tuning/creating various oxide properties. Understanding the behavior of oxygen vacancies is of paramount importance. In this study, we identify a metastable oxygen vacancy ordering state other than the well-known Magnéli phases in TiO2 crystals from both experimental and theoretical studies. The oxygen vacancy ordering is found to be a zigzag chain along the [0 0 1] direction in the (1 1 0) plane occurring in a wide temperature range of 200-500
more » ... . This metastable ordering state leads to a first-order phase transition accompanied by significant enhancement of dielectric permittivity and a memristive effect featuring a low driving electric field. Our results can improve oxide properties by engineering oxygen vacancies.
doi:10.1016/j.scib.2020.02.013 pmid:36659132 fatcat:egnrmn4ifnawzfisqogkkbqt5q