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

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

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
Accepted manuscript online:

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 (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 2014 Chin. Phys. B 23 110701

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

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