FANG Leiming, CHEN Xiping, XIE Lei, HE Duanwei, HU Qiwei, LI Xin, JIANG Mingquan, SUN Guang’ai, CHEN Bo, PENG Shuming, LI Hao, HAN Tiexin. High Pressure Neutron Diffraction Technology and Applications at CMRR[J]. Chinese Journal of High Pressure Physics, 2020, 34(5): 050104. doi: 10.11858/gywlxb.20200588
Citation:
FANG Leiming, CHEN Xiping, XIE Lei, HE Duanwei, HU Qiwei, LI Xin, JIANG Mingquan, SUN Guang’ai, CHEN Bo, PENG Shuming, LI Hao, HAN Tiexin. High Pressure Neutron Diffraction Technology and Applications at CMRR[J]. Chinese Journal of High Pressure Physics, 2020, 34(5): 050104. doi: 10.11858/gywlxb.20200588
FANG Leiming, CHEN Xiping, XIE Lei, HE Duanwei, HU Qiwei, LI Xin, JIANG Mingquan, SUN Guang’ai, CHEN Bo, PENG Shuming, LI Hao, HAN Tiexin. High Pressure Neutron Diffraction Technology and Applications at CMRR[J]. Chinese Journal of High Pressure Physics, 2020, 34(5): 050104. doi: 10.11858/gywlxb.20200588
Citation:
FANG Leiming, CHEN Xiping, XIE Lei, HE Duanwei, HU Qiwei, LI Xin, JIANG Mingquan, SUN Guang’ai, CHEN Bo, PENG Shuming, LI Hao, HAN Tiexin. High Pressure Neutron Diffraction Technology and Applications at CMRR[J]. Chinese Journal of High Pressure Physics, 2020, 34(5): 050104. doi: 10.11858/gywlxb.20200588
FENGHUANG diffractometer at CMRR is a neutron diffractometer dedicated for high pressure experiments. After updating the neutron guide and monochromator, now the neutron flux at the sample position can get increased up to 2.84×106 ns–1·cm–2.Based on the FENGHUANG diffractometer, comprehensive high pressure devices and techniques have been developed, such as gas cells, piston cylinders cell, clamp cell, PE press (VX4), opposite anvil press (HP3-1500) along with sample heating and cooling system, and the alignment system for high pressure devices. Moreover, with the modified high pressure and high temperature cell assemblies, the pressure can be up to 34 GPa while the temperature reaches 1500 ℃ at maximum in the angle-dispersive neutron diffraction. Recently, some scientific research have been performed, like the solubility of NaCl at high pressure, the intergranular strain evolution of HMX, and the pressure-induced polymerization. All these experimental experiences from FENGHUANG diffractometer could not only help to promote the development of high pressure techniques on neutron scattering facilities, but also contribute to the users for their high pressure studies.
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FANG Leiming, CHEN Xiping, XIE Lei, HE Duanwei, HU Qiwei, LI Xin, JIANG Mingquan, SUN Guang’ai, CHEN Bo, PENG Shuming, LI Hao, HAN Tiexin. High Pressure Neutron Diffraction Technology and Applications at CMRR[J]. Chinese Journal of High Pressure Physics, 2020, 34(5): 050104. doi: 10.11858/gywlxb.20200588
FANG Leiming, CHEN Xiping, XIE Lei, HE Duanwei, HU Qiwei, LI Xin, JIANG Mingquan, SUN Guang’ai, CHEN Bo, PENG Shuming, LI Hao, HAN Tiexin. High Pressure Neutron Diffraction Technology and Applications at CMRR[J]. Chinese Journal of High Pressure Physics, 2020, 34(5): 050104. doi: 10.11858/gywlxb.20200588
Figure 2. HP3-1500 high pressure device for FENGHUANG diffractometer
Figure 3. Neutron diffraction patterns of NaCl at different loading forces
Figure 4. Pressures of piston cylinders cell in the experiment and calculation
Figure 5. (a) ST WC anvil and gasket, (b) DT WC anvil and gasket, and (c) neutron diffraction patterns of Fe with ST and DT anvils at different loading forces (Modified for Ref. [30])
Figure 6. Modified DT assembly for the neutron diffraction experiments
Figure 7. High pressure neutron diffraction patterns of pure metal Ni at different pressure (Peaks of MgO and diamond come from pressure transmitting medium and anvil, respectively.)
Figure 8. Schematic of high pressure-high temperature assembly for neutron diffraction experiments
Figure 9. Neutron diffraction patterns of MgO at different pressure and temperature (Peaks of ZrO2 and WC come from pressure transmitting medium and anvil, respectively)
Figure 10. Neutron diffraction patterns of NaCl at different loading forces (Inset is the piston-cylinder cell)[42]
Figure 11. Solubility of NaCl at different pressures[42]
Figure 12. Neutron diffraction patterns of HMX at different pressures (Modified for Ref.[46])
Figure 13. High pressure neutron diffraction patterns of C6H6-C6F6 cocrystal (Modified for Ref.[50])
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