中国物理B ›› 2017, Vol. 26 ›› Issue (7): 76103-076103.doi: 10.1088/1674-1056/26/7/076103

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

Crystal structures and electronic properties of solid fluorine under high pressure

Qianqian Lv(吕欠欠), Xilian Jin(靳锡联), Tian Cui(崔田), Quan Zhuang(庄全), Ying Li(李颖), Youchun Wang(王友春), Kuo Bao(包括), Xing Meng(孟醒)   

  1. State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
  • 收稿日期:2017-02-18 修回日期:2017-04-07 出版日期:2017-07-05 发布日期:2017-07-05
  • 通讯作者: Xilian Jin, Tian Cui E-mail:jinxilian@jlu.edu.cn;cuitian@jlu.edu.cn
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant Nos.51632002,51572108,11634004,and 11174102),Program for Changjiang Scholars and Innovative Research Team in University,China (Grant No.IRT_15R23),the National Fund for Fostering Talents of Basic Science,China (Grant No.J1103202),and the Development Program of Science and Technology of Jilin Province,China (Grant No.20150312002ZG).

Crystal structures and electronic properties of solid fluorine under high pressure

Qianqian Lv(吕欠欠), Xilian Jin(靳锡联), Tian Cui(崔田), Quan Zhuang(庄全), Ying Li(李颖), Youchun Wang(王友春), Kuo Bao(包括), Xing Meng(孟醒)   

  1. State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
  • Received:2017-02-18 Revised:2017-04-07 Online:2017-07-05 Published:2017-07-05
  • Contact: Xilian Jin, Tian Cui E-mail:jinxilian@jlu.edu.cn;cuitian@jlu.edu.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant Nos.51632002,51572108,11634004,and 11174102),Program for Changjiang Scholars and Innovative Research Team in University,China (Grant No.IRT_15R23),the National Fund for Fostering Talents of Basic Science,China (Grant No.J1103202),and the Development Program of Science and Technology of Jilin Province,China (Grant No.20150312002ZG).

摘要:

As the previously proposed structures of C2/m and C2/c possess similar enthalpies and x-ray diffraction patterns, the space group of fluorine at ambient pressure is in controversy. We successfully obtain its thermodynamically stable low-pressure phase, which shares the same structure as the earlier known C2/c. Further investigations on phonon spectra reveal the instability of the C2/m structure with imaginary frequency in the Brillouin zone and confirm the dynamically stable property of the C2/c structure at the same time. Compressing fluorine up to 8 GPa, the C2/c phase is found to undergo a phase transition to a new structure with a space group of Cmca. Electronic energy band structures indicate the insulating feature of C2/c and Cmca with no bands across the Fermi level. The infrared (IR) and Raman spectra of C2/c and Cmca at selected pressures are calculated to provide useful information to future experiments.

关键词: fluorine, structure, insulating feature

Abstract:

As the previously proposed structures of C2/m and C2/c possess similar enthalpies and x-ray diffraction patterns, the space group of fluorine at ambient pressure is in controversy. We successfully obtain its thermodynamically stable low-pressure phase, which shares the same structure as the earlier known C2/c. Further investigations on phonon spectra reveal the instability of the C2/m structure with imaginary frequency in the Brillouin zone and confirm the dynamically stable property of the C2/c structure at the same time. Compressing fluorine up to 8 GPa, the C2/c phase is found to undergo a phase transition to a new structure with a space group of Cmca. Electronic energy band structures indicate the insulating feature of C2/c and Cmca with no bands across the Fermi level. The infrared (IR) and Raman spectra of C2/c and Cmca at selected pressures are calculated to provide useful information to future experiments.

Key words: fluorine, structure, insulating feature

中图分类号:  (Theory of crystal structure, crystal symmetry; calculations and modeling)

  • 61.50.Ah
61.50.Ks (Crystallographic aspects of phase transformations; pressure effects) 61.66.Bi (Elemental solids)