Title
Metastable oxygen vacancy ordering state and improved memristive behavior in TiO2 crystals
RIS ID
141909
Abstract
2020 Science China Press 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 °C. 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.
Publication Details
Li, T., Hong, F., Yang, K., Yue, B., Tamura, N., Wu, H., Cheng, Z. & Wang, C. (2020). Metastable oxygen vacancy ordering state and improved memristive behavior in TiO2 crystals. Science Bulletin,