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...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[001]direction in the(110)plane occurring in a wide temperature range of 200–500℃.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.展开更多
基金supported by the National Natural Science Foundation of China(51872001,51572001,11404002,11404003,11474059,and 11674064)Open Research Fund Program of the State Key Laboratory of Low-Dimensional Quantum Physics(KF201803)+1 种基金the National Key Research and Development Program of China(2016YFA0300700)Australia Research Council,and the U.S.Department of Energy under Contract no.DE-AC02-05CH11231。
文摘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[001]direction in the(110)plane occurring in a wide temperature range of 200–500℃.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.
