中国物理B ›› 2018, Vol. 27 ›› Issue (1): 17102-017102.doi: 10.1088/1674-1056/27/1/017102

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

Structural, electronic, and mechanical properties of cubic TiO2: A first-principles study

Debashish Dash, Chandan K Pandey, Saurabh Chaudhury, Susanta K Tripathy   

  1. 1 Department of Electrical Engineering, National Institute of Technology, Silchar, Assam 788010, India;
    2 Department of Electronics and Communication Engineering, National Institute of Technology, Silchar, Assam 788010, India
  • 收稿日期:2017-08-01 修回日期:2017-09-29 出版日期:2018-01-05 发布日期:2018-01-05
  • 通讯作者: Debashish Dash E-mail:debashishdashnits@gmail.com

Structural, electronic, and mechanical properties of cubic TiO2: A first-principles study

Debashish Dash1, Chandan K Pandey1, Saurabh Chaudhury1, Susanta K Tripathy2   

  1. 1 Department of Electrical Engineering, National Institute of Technology, Silchar, Assam 788010, India;
    2 Department of Electronics and Communication Engineering, National Institute of Technology, Silchar, Assam 788010, India
  • Received:2017-08-01 Revised:2017-09-29 Online:2018-01-05 Published:2018-01-05
  • Contact: Debashish Dash E-mail:debashishdashnits@gmail.com

摘要: We present an analysis of structural, electronic, and mechanical properties of cubic titanium dioxide (TiO2) using an all electron orthogonalzed linear combinations of atomic orbitals (OLCAO) basis set under the framework of density functional theory (DFT). The structural property, especially the lattice constant a, and the electronic properties such as the band diagram and density of states (DOS) are studied and analyzed. The mechanical properties such as bulk moduli, shear moduli, Young's Moduli, and Poison's ratio are also investigated thoroughly. The calculations are carried out on shear moduli and anisotropy factor for cubic TiO2. The Vickers hardness is also tested for fluorite and pyrite cubic-structured TiO2. Furthermore, the results are compared with the previous theoretical and experimental results. It is found that DFT-based simulation produces results which are approximation to experimental results, whereas the calculated elastic constants are better than the previous theoretical and experimental values.

关键词: density functional theory, cubic TiO2, structural, electronic, and mechanical properties

Abstract: We present an analysis of structural, electronic, and mechanical properties of cubic titanium dioxide (TiO2) using an all electron orthogonalzed linear combinations of atomic orbitals (OLCAO) basis set under the framework of density functional theory (DFT). The structural property, especially the lattice constant a, and the electronic properties such as the band diagram and density of states (DOS) are studied and analyzed. The mechanical properties such as bulk moduli, shear moduli, Young's Moduli, and Poison's ratio are also investigated thoroughly. The calculations are carried out on shear moduli and anisotropy factor for cubic TiO2. The Vickers hardness is also tested for fluorite and pyrite cubic-structured TiO2. Furthermore, the results are compared with the previous theoretical and experimental results. It is found that DFT-based simulation produces results which are approximation to experimental results, whereas the calculated elastic constants are better than the previous theoretical and experimental values.

Key words: density functional theory, cubic TiO2, structural, electronic, and mechanical properties

中图分类号:  (Density functional theory, local density approximation, gradient and other corrections)

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