中国物理B ›› 2017, Vol. 26 ›› Issue (3): 36301-036301.doi: 10.1088/1674-1056/26/3/036301

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇    下一篇

Mechanical and thermodynamical stability of BiVO4 polymorphs using first-principles study

A K M Farid Ul Islam, Md Nurul Huda Liton, H M Tariqul Islam, Md Al Helal, Md Kamruzzaman   

  1. 1 Department of Computer Science and Engineering, Begum Rokeya University, Rangpur, Rangpur-5400, Bangladesh;
    2 Department of Physics, Begum Rokeya University, Rangpur, Rangpur-5400, Bangladesh;
    3 Department of Chemistry, Begum Rokeya University, Rangpur, Rangpur-5400, Bangladesh;
    4 Department of Physics and Materials Science and Center of Super-Diamond and Advanced Films(COSDAF), City University of Hong Kong, Hong Kong SAR, China
  • 收稿日期:2016-06-09 修回日期:2016-12-07 出版日期:2017-03-05 发布日期:2017-03-05
  • 通讯作者: A K M Farid Ul Islam E-mail:farid_ru@yahoo.com

Mechanical and thermodynamical stability of BiVO4 polymorphs using first-principles study

A K M Farid Ul Islam1, Md Nurul Huda Liton2, H M Tariqul Islam3, Md Al Helal2, Md Kamruzzaman4   

  1. 1 Department of Computer Science and Engineering, Begum Rokeya University, Rangpur, Rangpur-5400, Bangladesh;
    2 Department of Physics, Begum Rokeya University, Rangpur, Rangpur-5400, Bangladesh;
    3 Department of Chemistry, Begum Rokeya University, Rangpur, Rangpur-5400, Bangladesh;
    4 Department of Physics and Materials Science and Center of Super-Diamond and Advanced Films(COSDAF), City University of Hong Kong, Hong Kong SAR, China
  • Received:2016-06-09 Revised:2016-12-07 Online:2017-03-05 Published:2017-03-05
  • Contact: A K M Farid Ul Islam E-mail:farid_ru@yahoo.com

摘要: First principles calculations of structural, electronic, mechanical, and thermodynamic properties of different polymorphs of BiVO4 are performed using Bender-type plane/wave ultrasoft pseudopotentials within the generalized gradient approximation (GGA) in the frame of density functional theory (DFT). The calculated structural and electronic properties are consistent with the previous theoretical and experimental results. The electronic structures reveal that m-BiVO4, op-BiVO4, and st-BiVO4 have indirect band gaps, on the other hand, zt-BiVO4 has a direct band gap. From the DOS and Mulliken's charge analysis, it is observed that only m-BiVO4 has 6s2 Bi lone pair. Bond population analysis indicates that st-BiVO4 shows a more ionic nature and a similar result is obtained from the elastic properties. From the elastic properties, it is observed that st-BiVO4 is more mechanically stable than the others. st-BiVO4 is more ductile and useful for high electro-optical and electro-mechanical coupling devices. Our calculated thermodynamic properties confirm the similar characteristics found from electronic and elastic properties. m-BiVO4 is useful as photocatalysts, solid state electrolyte, and electrode and other polymorphs are applicable in electronic device fabrications.

关键词: BiVO4, crystal structure, lone pair, mechanical stability

Abstract: First principles calculations of structural, electronic, mechanical, and thermodynamic properties of different polymorphs of BiVO4 are performed using Bender-type plane/wave ultrasoft pseudopotentials within the generalized gradient approximation (GGA) in the frame of density functional theory (DFT). The calculated structural and electronic properties are consistent with the previous theoretical and experimental results. The electronic structures reveal that m-BiVO4, op-BiVO4, and st-BiVO4 have indirect band gaps, on the other hand, zt-BiVO4 has a direct band gap. From the DOS and Mulliken's charge analysis, it is observed that only m-BiVO4 has 6s2 Bi lone pair. Bond population analysis indicates that st-BiVO4 shows a more ionic nature and a similar result is obtained from the elastic properties. From the elastic properties, it is observed that st-BiVO4 is more mechanically stable than the others. st-BiVO4 is more ductile and useful for high electro-optical and electro-mechanical coupling devices. Our calculated thermodynamic properties confirm the similar characteristics found from electronic and elastic properties. m-BiVO4 is useful as photocatalysts, solid state electrolyte, and electrode and other polymorphs are applicable in electronic device fabrications.

Key words: BiVO4, crystal structure, lone pair, mechanical stability

中图分类号:  (First-principles theory)

  • 63.20.dk
71.20.Nr (Semiconductor compounds) 74.25.Ld (Mechanical and acoustical properties, elasticity, and ultrasonic Attenuation) 73.22.-f (Electronic structure of nanoscale materials and related systems)