摘要
巴黎-爱丁堡压机(Paris-Edinbrugh press)因具有大体积样品、便携、结构简单等优点,被广泛应用于中子源进行高压原位中子衍射实验.但因单轴加压而导致封垫和组装不断沿径向向外流动的特点,给高压下组装的加热效率、保温效果、上下压砧的绝缘及热电偶连接等方面带来困难,从而使得巴黎-爱丁堡压机在高压下的温度加载非常具有挑战性.本文通过对高温高压组装的结构进行优化设计,提高了组装的加热效率和保温效果.通过对热电偶引线方式的优化,实现了高压下温度的直接测量.设计的HPT-3组装和HPT-3.5组装在高压下的温度加载最高可分别达到2000 K和1500 K,并且二者较大的样品尺寸满足中子衍射实验的需求.原位高温高压中子衍射实验结果说明,HPT-3组装在压力8.5 GPa、温度1508 K的条件下可以获得高质量的样品的中子衍射谱,同时该结果也进一步验证了所设计组装的良好稳定性.
Paris-Edinbrugh(PE)press has been widely used in high pressure in-situ neutron diffraction experiments due to its advantages of large sample size,portability and simple structure.However,with the characteristics of uniaxial load of PE press,the weak lateral support makes the gasket and cell assembly continue flowing outward.So,the development of cell assembly of PE press that can simultaneously work under high pressure and high temperature(high P-T)is a great challenge.In this work,we design three-segment high P-T assembly of PE press for neutron diffraction,which can significantly improve the heating efficiency,thermal insulation,and stability of assembly.By using the fanned Cu foil leads of thermocouple,we realize the in-situ measurement of assembly temperature under a high pressure up to 5 GPa.The designed HPT-3 and HPT-3.5 assemblies can arrive at 2034 K and 1515 K respectively,which are measured by thermocouple.The high P-T experiments of HPT-3 assembly are carried out on a high-pressure neutron diffraction spectrometer(Fenghuang)of China Mianyang Research Reactor(CMRR).The results show that the designed assembly can simultaneously achieve high P-T of 8.5 GPa and 1508 K with collecting the high-quality neutron diffraction data of MgO cylindrical sample.
作者
杨功章
谢雷
陈喜平
何瑞琦
韩铁鑫
牛国梁
房雷鸣
贺端威
Yang Gong-Zhang;Xie Lei;Chen Xi-Ping;He Rui-Qi;Han Tie-Xin;Niu Guo-Liang;Fang Lei-Ming;He Duan-Wei(Institute of Atomic and Molecular Physics,Sichuan University,Chengdu 610065,China;Key Laboratory for Neutron Physics,Institute of Nuclear Physics and Chemistry,China Academy of Engineering Physics,Mianyang 621999,China;Guangdong Zhengxin Hard Material Technology R&D Co.,Ltd,Heyuan 517000,China)
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2022年第15期196-202,共7页
Acta Physica Sinica
基金
国家自然科学基金(批准号:12075215,11427810)
国家重点研发计划(批准号:2016YFA0401503)
科学挑战专题(批准号:TZ2016001)资助的课题。
关键词
巴黎-爱丁堡压机
高温高压
原位测温
中子衍射
Paris-Edinbrugh press
high pressure and high temperature
in-situ measurement temperature
neutron diffraction
