| A pressure calibration method for a portable wide-access ＂panoramic＂ cell |
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| 引用本文： | 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(11):246-250. |
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| 作者姓名： | 房雷鸣 王云 陈喜平 孙光爱 陈波 彭述明 |
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| 作者单位： | Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics |
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| 基金项目： | Project supported by the National Natural Science Foundation of China （Grant Nos. 91126001, 11105128, and 51231002）.
The authors thank Prof. Duanwei He （Institute of Physics, Chinese Academy of Sciences） for the fruitful discussion. |
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| 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 displace- ment （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 ram.
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| 关 键 词： | 压力范围 校准方法 便携式 单元 全景 中子衍射 校正技术 校正曲线 |
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