中国物理B ›› 2021, Vol. 30 ›› Issue (7): 76401-076401.doi: 10.1088/1674-1056/abf4bd

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Anomalous bond-length behaviors of solid halogens under pressure

Min Wu(吴旻)1, Ye-Feng Wu(吴烨峰)1, and Yi Ma(马毅)2,†   

  1. 1 College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou, 310014, China;
    2 College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310014, China
  • 收稿日期:2021-02-27 修回日期:2021-03-31 接受日期:2021-04-05 出版日期:2021-06-22 发布日期:2021-07-09
  • 通讯作者: Yi Ma E-mail:may@zjut.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 51701180, 51871201, U1802254). Computations were performed at the MSE Computer Center of Zhejiang University of Technology in China.

Anomalous bond-length behaviors of solid halogens under pressure

Min Wu(吴旻)1, Ye-Feng Wu(吴烨峰)1, and Yi Ma(马毅)2,†   

  1. 1 College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou, 310014, China;
    2 College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310014, China
  • Received:2021-02-27 Revised:2021-03-31 Accepted:2021-04-05 Online:2021-06-22 Published:2021-07-09
  • Contact: Yi Ma E-mail:may@zjut.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 51701180, 51871201, U1802254). Computations were performed at the MSE Computer Center of Zhejiang University of Technology in China.

摘要: The three halogen solids (Cl2, Br2, and I2) have the isostructural diatomic molecular phase I with a space group of Cmca at ambient pressure. At high pressure, they all go through an intermediate phase V with incommensurate structures before eventually dissociating into the monatomic phase Ⅱ. However, a new structural transition between phase I and V with anomalous bond-length behavior was observed in bromine under pressure, which, so far, has not been confirmed in iodine and chlorine. Here, we perform first-principles calculations for iodine and chlorine. The new structural transition was predicted to be common to all three halogens under pressure. The transition pressures might be systematically underestimated by the imperfect van der Waals correction method, but they follow the order Cl2 > Br2 > I2, which is consistent with other pressure-induced structural transitions such as metallization and the molecular-to-monatomic transition.

关键词: high pressure, structural transition, halogen, first-principles calculation

Abstract: The three halogen solids (Cl2, Br2, and I2) have the isostructural diatomic molecular phase I with a space group of Cmca at ambient pressure. At high pressure, they all go through an intermediate phase V with incommensurate structures before eventually dissociating into the monatomic phase Ⅱ. However, a new structural transition between phase I and V with anomalous bond-length behavior was observed in bromine under pressure, which, so far, has not been confirmed in iodine and chlorine. Here, we perform first-principles calculations for iodine and chlorine. The new structural transition was predicted to be common to all three halogens under pressure. The transition pressures might be systematically underestimated by the imperfect van der Waals correction method, but they follow the order Cl2 > Br2 > I2, which is consistent with other pressure-induced structural transitions such as metallization and the molecular-to-monatomic transition.

Key words: high pressure, structural transition, halogen, first-principles calculation

中图分类号:  (General studies of phase transitions)

  • 64.60.-i
64.70.kt (Molecular crystals) 62.50.-p (High-pressure effects in solids and liquids) 31.15.A- (Ab initio calculations)