中国物理B ›› 2016, Vol. 25 ›› Issue (12): 120702-120702.doi: 10.1088/1674-1056/25/12/120702

• GENERAL • 上一篇    下一篇

Evidence of polymorphic transformations of Sn under high pressure

Qiu-Min Jing(敬秋民), Yu-Hong Cao(曹玉红), Yi Zhang(张毅), Shou-Rui Li(李守瑞), Qiang He(何强), Qi-Yue Hou(侯琪玥), Sheng-Gang Liu(刘盛刚), Lei Liu(柳雷), Yan Bi(毕延), Hua-Yun Geng(耿华运), Qiang Wu(吴强)   

  1. 1. National Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621900, China;
    2. Metrology Testing Center for China Academy of Engineering Physics, Mianyang 621900, China
  • 收稿日期:2016-06-22 修回日期:2016-08-20 出版日期:2016-12-05 发布日期:2016-12-05
  • 通讯作者: Qiu-Min Jing, Yi Zhang E-mail:j_qm@163.com;zhangyi@caep.ac.cn
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 11304294 and 11274281) and the Science Fund from the National Laboratory of Shock Wave and Detonation Physics of China (Grant Nos. 9140C670201140C67281 and 9140C670102150C67288).

Evidence of polymorphic transformations of Sn under high pressure

Qiu-Min Jing(敬秋民)1, Yu-Hong Cao(曹玉红)2, Yi Zhang(张毅)1, Shou-Rui Li(李守瑞)1, Qiang He(何强)1, Qi-Yue Hou(侯琪玥)1, Sheng-Gang Liu(刘盛刚)1, Lei Liu(柳雷)1, Yan Bi(毕延)1, Hua-Yun Geng(耿华运)1, Qiang Wu(吴强)1   

  1. 1. National Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621900, China;
    2. Metrology Testing Center for China Academy of Engineering Physics, Mianyang 621900, China
  • Received:2016-06-22 Revised:2016-08-20 Online:2016-12-05 Published:2016-12-05
  • Contact: Qiu-Min Jing, Yi Zhang E-mail:j_qm@163.com;zhangyi@caep.ac.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 11304294 and 11274281) and the Science Fund from the National Laboratory of Shock Wave and Detonation Physics of China (Grant Nos. 9140C670201140C67281 and 9140C670102150C67288).

摘要:

The high-pressure polymorphs and structural transformation of Sn were experimentally investigated using angle-dispersive synchrotron x-ray diffraction up to 108.9 GPa. The results show that at least at 12.8 GPa β-Sn→bct structure transformation was completed and no two-phase coexistence was found. By using a long-wavelength x-ray, we resolved the diffraction peaks splitting and discovered the formation of a new distorted orthorhombic structure bco from the bct structure at 31.8 GPa. The variation of the lattice parameters and their ratios with pressure further validate the observation of the bco polymorph. The bcc structure appears at 40.9 GPa and coexists with the bco phase throughout a wide pressure range of 40.9 GPa-73.1 GPa. Above 73.1 GPa, only the bcc polymorph is observed. The systematically experimental investigation confirms the phase transition sequence of Sn as β-Sn→bct→bco→bco+bcc→bcc upon compression to 108.9 GPa at room temperature.

关键词: high-pressure, polymorph, structural transformation, Sn

Abstract:

The high-pressure polymorphs and structural transformation of Sn were experimentally investigated using angle-dispersive synchrotron x-ray diffraction up to 108.9 GPa. The results show that at least at 12.8 GPa β-Sn→bct structure transformation was completed and no two-phase coexistence was found. By using a long-wavelength x-ray, we resolved the diffraction peaks splitting and discovered the formation of a new distorted orthorhombic structure bco from the bct structure at 31.8 GPa. The variation of the lattice parameters and their ratios with pressure further validate the observation of the bco polymorph. The bcc structure appears at 40.9 GPa and coexists with the bco phase throughout a wide pressure range of 40.9 GPa-73.1 GPa. Above 73.1 GPa, only the bcc polymorph is observed. The systematically experimental investigation confirms the phase transition sequence of Sn as β-Sn→bct→bco→bco+bcc→bcc upon compression to 108.9 GPa at room temperature.

Key words: high-pressure, polymorph, structural transformation, Sn

中图分类号:  (High-pressure apparatus; shock tubes; diamond anvil cells)

  • 07.35.+k
62.50.-p (High-pressure effects in solids and liquids) 61.05.cp (X-ray diffraction) 61.50.Ks (Crystallographic aspects of phase transformations; pressure effects)