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

Journal Article


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.

UOW Authors


  •   Li, Tianyu (external author)
  •   Hong, Fang (external author)
  •   Yang, Ke (external author)
  •   Yue, Binbin (external author)
  •   Tamura, Nobumichi (external author)
  •   Wu, Hua (external author)
  •   Cheng, Zhenxiang
  •   Wang, Chunchang (external author)

Publication Date


  • 2020

Citation


  • 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,

Scopus Eid


  • 2-s2.0-85080055087

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/4049

Place Of Publication


  • China

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.

UOW Authors


  •   Li, Tianyu (external author)
  •   Hong, Fang (external author)
  •   Yang, Ke (external author)
  •   Yue, Binbin (external author)
  •   Tamura, Nobumichi (external author)
  •   Wu, Hua (external author)
  •   Cheng, Zhenxiang
  •   Wang, Chunchang (external author)

Publication Date


  • 2020

Citation


  • 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,

Scopus Eid


  • 2-s2.0-85080055087

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/4049

Place Of Publication


  • China