Proceedings of the Korean Vacuum Society Conference (한국진공학회:학술대회논문집)

The Korean Vacuum Society (한국진공학회)
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Synthesis and Temperature-Dependent Local Structural Properties of Ti2O3

  • Hwang, Inhui (Department of Physics Education and Institute of Fusion Science, Chonbuk National University) ;
  • Jin, Zhenlan (Department of Physics Education and Institute of Fusion Science, Chonbuk National University) ;
  • Park, Changin (Department of Physics Education and Institute of Fusion Science, Chonbuk National University) ;
  • Jiang, Bingzhi (Department of Physics, Yanbian University) ;
  • Han, S.W. (Department of Physics Education and Institute of Fusion Science, Chonbuk National University)
  • Published : 2013.08.21
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Abstract

Ti2O3 is known as a typical Mott insulator with a transition temperature of near $200^{\circ}C$. Unlike VO2, Ti2O3 does not have a structural phase transition near the metal-insulator-transition (MIT) temperature. We investigated the temperature-dependent thermal vibration change using temperature-dependent x-ray absorption fine structure (XAFS) at Ti K-edge in the temperature range of 300~600 K. Ti2O3 powder and films were synthesized using thermal chemical vapor deposition (CVD) at $800{\sim}900^{\circ}C$. X-ray diffraction measurements show a single phased Ti2O3 at room temperature. XAFS confirmed no structural phase transition in the temperature of 300~600 K. A small but distinguishable structural disorder change was observed near the transition temperature. We will discuss the MIT behavior with the change of structural disorder.

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