A pressure calibration method for a portable wide-access “panoramic” cell

doi:10.1088/1674-1056/23/11/110701

中国物理B ›› 2014, Vol. 23 ›› Issue (11): 110701-110701.doi: 10.1088/1674-1056/23/11/110701

A pressure calibration method for a portable wide-access “panoramic” cell

房雷鸣, 王云, 陈喜平, 孙光爱, 陈波, 彭述明

Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China

收稿日期:2014-04-09 修回日期:2014-05-20 出版日期:2014-11-15 发布日期:2014-11-15
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 91126001, 11105128, and 51231002).

A pressure calibration method for a portable wide-access “panoramic” cell

Fang Lei-Ming (房雷鸣), Wang Yun (王云), Chen Xi-Ping (陈喜平), Sun Guang-Ai (孙光爱), Chen Bo (陈波), Peng Shu-Ming (彭述明)

Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China

Received:2014-04-09 Revised:2014-05-20 Online:2014-11-15 Published:2014-11-15
Contact: Fang Lei-Ming E-mail:flmyaya2008@163.com
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 91126001, 11105128, and 51231002).

摘要/Abstract

摘要： A simple and convenient pressure calibration method is developed for a newly designed portable wide-access ‘panoramic’cell. This cell is adapted to angle-dispersive-mode high-pressure in situ neutron diffraction of reactor neutron sources. This pressure calibration method has established a relationship between the cell pressure and the anvil displacement (gasket compression) based on the fixed-point calibration technique. By employing TiZr gasket with a thickness of 3 mm and WC anvil with a culet of 4 mm diameter, the average anvil displacements are 1.31 mm and 2.22 mm for Bi phase transitions (2.55 GPa and 7.7 GPa), and 1.85 mm for Ba phase transitions (5.5 GPa), respectively. In this pressure range, the pressure increases quickly with decreasing gasket thickness, and undergoes a linear increase with the anvil displacement. By extrapolating the calibration curve, the cell pressure will achieve 10 GPa when the anvil displacement is around 2.5 mm.

关键词: pressure calibration, neutron diffraction, phase transition

Abstract: A simple and convenient pressure calibration method is developed for a newly designed portable wide-access ‘panoramic’cell. This cell is adapted to angle-dispersive-mode high-pressure in situ neutron diffraction of reactor neutron sources. This pressure calibration method has established a relationship between the cell pressure and the anvil displacement (gasket compression) based on the fixed-point calibration technique. By employing TiZr gasket with a thickness of 3 mm and WC anvil with a culet of 4 mm diameter, the average anvil displacements are 1.31 mm and 2.22 mm for Bi phase transitions (2.55 GPa and 7.7 GPa), and 1.85 mm for Ba phase transitions (5.5 GPa), respectively. In this pressure range, the pressure increases quickly with decreasing gasket thickness, and undergoes a linear increase with the anvil displacement. By extrapolating the calibration curve, the cell pressure will achieve 10 GPa when the anvil displacement is around 2.5 mm.

Key words: pressure calibration, neutron diffraction, phase transition

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

07.35.+k

47.80.Fg (Pressure and temperature measurements) 61.05.F- (Neutron diffraction and scattering) 61.50.Ks (Crystallographic aspects of phase transformations; pressure effects)

房雷鸣, 王云, 陈喜平, 孙光爱, 陈波, 彭述明. A pressure calibration method for a portable wide-access “panoramic” cell[J]. 中国物理B, 2014, 23(11): 110701-110701.

Fang Lei-Ming (房雷鸣), Wang Yun (王云), Chen Xi-Ping (陈喜平), Sun Guang-Ai (孙光爱), Chen Bo (陈波), Peng Shu-Ming (彭述明). A pressure calibration method for a portable wide-access “panoramic” cell[J]. Chin. Phys. B, 2014, 23(11): 110701-110701.

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A pressure calibration method for a portable wide-access “panoramic” cell

A pressure calibration method for a portable wide-access “panoramic” cell

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