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Chin. Phys. B, 2014, Vol. 23(11): 110701    DOI: 10.1088/1674-1056/23/11/110701
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A pressure calibration method for a portable wide-access “panoramic” cell

Fang Lei-Ming, Wang Yun, Chen Xi-Ping, Sun Guang-Ai, Chen Bo, Peng Shu-Ming
Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China
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.
Keywords:  pressure calibration      neutron diffraction      phase transition  
Received:  09 April 2014      Revised:  20 May 2014      Published:  15 November 2014
PACS:  07.35.+k (High-pressure apparatus; shock tubes; diamond anvil cells)  
  47.80.Fg (Pressure and temperature measurements)  
  61.05.F- (Neutron diffraction and scattering)  
  61.50.Ks (Crystallographic aspects of phase transformations; pressure effects)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 91126001, 11105128, and 51231002).
Corresponding Authors:  Fang Lei-Ming     E-mail:  flmyaya2008@163.com

Cite this article: 

Fang Lei-Ming, Wang Yun, Chen Xi-Ping, Sun Guang-Ai, Chen Bo, Peng Shu-Ming A pressure calibration method for a portable wide-access “panoramic” cell 2014 Chin. Phys. B 23 110701

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