中国物理B ›› 2018, Vol. 27 ›› Issue (5): 56101-056101.doi: 10.1088/1674-1056/27/5/056101

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

Compression behavior and phase transition of β-Si3N4 under high pressure

Hong-xia Gong(龚红霞), Zi-li Kou(寇自力), Cong Fan(樊聪), Hao Liang(梁浩), Qi-ming Wang(王齐明), Lei-lei Zhang(张雷雷), Fang Peng(彭放), Ming Yang(杨鸣), Xiao-lin Ni(倪小林), Jing Liu(刘景)   

  1. 1 Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China;
    2 Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
  • 收稿日期:2017-11-25 修回日期:2018-02-02 出版日期:2018-05-05 发布日期:2018-05-05
  • 通讯作者: Zi-li Kou E-mail:kouzili@scu.edu.cn

Compression behavior and phase transition of β-Si3N4 under high pressure

Hong-xia Gong(龚红霞)1, Zi-li Kou(寇自力)1, Cong Fan(樊聪)1, Hao Liang(梁浩)1, Qi-ming Wang(王齐明)1, Lei-lei Zhang(张雷雷)1, Fang Peng(彭放)1, Ming Yang(杨鸣)1, Xiao-lin Ni(倪小林)1, Jing Liu(刘景)2   

  1. 1 Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China;
    2 Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
  • Received:2017-11-25 Revised:2018-02-02 Online:2018-05-05 Published:2018-05-05
  • Contact: Zi-li Kou E-mail:kouzili@scu.edu.cn

摘要:

The compressibility and pressure-induced phase transition of β-Si3N4 were investigated by using an angle dispersive x-ray diffraction technique in a diamond anvil cell at room temperature. Rietveld refinements of the x-ray powder diffraction data verified that the hexagonal structure (with space group P63/m, Z=2 formulas per unit cell) β-Si3N4 remained stable under high pressure up to 37 GPa. Upon increasing pressure, β-Si3N4 transformed to δ-Si3N4 at about 41 GPa. The initial β-Si3N4 was recovered as the pressure was released to ambient pressure, implying that the observed pressure-induced phase transformation was reversible. The pressure-volume data of β-Si3N4 was fitted by the third-order Birch-Murnaghan equation of state, which yielded a bulk modulus K0=273(2) GPa with its pressure derivative K'0=4 (fixed) and K0=278(2) GPa with K'0=5. Furthermore, the compressibility of the unit cell axes (a and c-axes) for the β-Si3N4 demonstrated an anisotropic property with increasing pressure.

关键词: phase transition, bulk modulus, β-Si3N4, high pressure in situ x-ray diffraction

Abstract:

The compressibility and pressure-induced phase transition of β-Si3N4 were investigated by using an angle dispersive x-ray diffraction technique in a diamond anvil cell at room temperature. Rietveld refinements of the x-ray powder diffraction data verified that the hexagonal structure (with space group P63/m, Z=2 formulas per unit cell) β-Si3N4 remained stable under high pressure up to 37 GPa. Upon increasing pressure, β-Si3N4 transformed to δ-Si3N4 at about 41 GPa. The initial β-Si3N4 was recovered as the pressure was released to ambient pressure, implying that the observed pressure-induced phase transformation was reversible. The pressure-volume data of β-Si3N4 was fitted by the third-order Birch-Murnaghan equation of state, which yielded a bulk modulus K0=273(2) GPa with its pressure derivative K'0=4 (fixed) and K0=278(2) GPa with K'0=5. Furthermore, the compressibility of the unit cell axes (a and c-axes) for the β-Si3N4 demonstrated an anisotropic property with increasing pressure.

Key words: phase transition, bulk modulus, β-Si3N4, high pressure in situ x-ray diffraction

中图分类号:  (X-ray diffraction)

  • 61.05.cp
31.15.ae (Electronic structure and bonding characteristics) 81.05.Je (Ceramics and refractories (including borides, carbides, hydrides, nitrides, oxides, and silicides))