计算物理 ›› 2000, Vol. 17 ›› Issue (3): 319-325.

• 论文 • 上一篇    下一篇

金红石TiO2晶体中F型色心电子结构及其吸收光谱研究

陈军1, 林理彬2, 卢铁城2   

  1. 1. 西南流体物理研究所冲击波与爆轰物理实验室, 四川 绵阳 621900;
    2. 四川大学辐射物理与技术开放实验室, 四川大学原子核技术研究所, 四川 成都 610064
  • 收稿日期:1998-06-16 修回日期:1999-05-10 出版日期:2000-05-25 发布日期:2000-05-25
  • 作者简介:陈军(1969~),男,博士,四川绵阳919信箱111分箱,621900.
  • 基金资助:
    国家自然科学基金资助项目(19805005)

THE ELECTRONIC STRUCTURE AND ABSORPTION SPECTRUM OF RUTIL TiO2 CRYSTAL WITH F TYPE COLOR CENTER

CHEN Jun1, LIN Li-bin2, LU Tie-cheng2   

  1. 1 Laboratory for Shock Wave and Detonation Physics Research, Southwest institute of Fluid Physics, Mianyang 621900, P R China;
    2 Institute of Nuclera Science and Technology, Radiation Physics and Ra
  • Received:1998-06-16 Revised:1999-05-10 Online:2000-05-25 Published:2000-05-25

摘要: 运用F型色心的类氢离子波函数结合电荷自洽离散变分方法,对TiO2晶体中F型色心的电子结构进行了计算,并利用能量最小原理优化了色心格点周围的Ti,O离子结构,得到了TiO2晶体中F,F+和F2+心的能带、态密度,并讨论了色心的光学跃迁模式。计算结果表明,F,F+心在TiO2晶体的禁带中引入了施主能级,F2+心在禁带中引入了浅受主能级,F和F+心的光学跃迁能分别是0.85eV,1.67eV .经还原后的TiO2晶体,在光吸收实验中测到的17μm(0.75eV),760nm(1.61eV)两个峰分别是由于还原过程中形成的F和F+心的吸收峰,并存在着F→F+的转型过程。

关键词: F, F+, F2+心, 能级结构, 跃迁能量

Abstract: The electronic structure of rutile TiO2 crystal with F-type color center is studied by using the H-like wave function and Discrite Variation method with the relaxation of ions around color center,and their energy band,density of states are obtained.The results show that F and F+ center have donor energy level in forbidden band,and F2+ center has acceptor energy level in forbidden band.The optical transition energy are 0.85 eV and 1.67 eV for F and F+ center,respectively.The optical absorption peaks 1.7μm(0.75 eV),760 nm(1.61 eV) in the reduced sample of TiO2 are due to the F and F+ center,and a transferring of F+→F existed.

Key words: F, F+, F2+center, energy level, transition energy

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