用于高压原位中子衍射的PCBN压腔  

In-Situ High-Pressure Neutron Diffraction with Supported PCBN Anvils

作　　者：张雅洁[1] 贺端威[1] 房雷鸣[2] 李欣 刘方明[1] 胡启威 陈吉 丁未[1] 王永华[1] ZHANG Ya-Jie;HE Duan-Wei;FANG Lei-Ming;LI Xin;LIU Fang-Ming;HU Qi-Wei;CHEN Ji;DING Wei;WANG Yong-Hua(Institute of Atomic and Molecular Physics ,Sichuan University ,Chengdu 610065 ,China;Institute of Nuclear Physics and Chemistry ,China Academy of Engineering Physics, Mianyang 621999 ,China)

机构地区：[1]四川大学原子与分子物理研究所,四川成都610065 [2]中国工程物理研究院核物理与化学研究所,四川绵阳621999

出　　处：《高压物理学报》2017年第6期735-741,共7页Chinese Journal of High Pressure Physics

基　　金：国家自然科学基金(11427810)

摘　　要：基于多晶立方氮化硼(PCBN)的高硬度以及对中子良好的吸收性,选用PCBN作为压砧材料,设计了一种新型外凹式平面压砧以及由钛锆合金、碳纤维管、聚四氟乙烯组成的复合封垫。使用该PCBN压腔,分别利用ZnTe和ZrW2O8的相变点对腔体压力进行标定。结果表明:当样品腔体积为9mm3、负载压力为260kN时,腔内压力达到9GPa。高压原位中子衍射实验显示,采用外凹式PCBN压腔得到了无压砧背底信号的铁的高压中子衍射谱。预计通过进一步优化,利用PCBN压腔可获得更高压力(10GPa以上)下高质量高压中子衍射谱。We used the polycrystalline cubic boron nitride （PCBN） as the anvil material based on its high hardness and strong absorption of neutrons,and designed a new type of concave-flat anvil and a hybrid gasket made of TiZr alloy, carbon fiber and teflon. The PCBN cell pressure was calibrated using the transformation points of ZnTe and ZrW2 08 respectively. The results show that the cell pressure reaches 9 GPa with the sample cell volume of 9 mm^3 when the load pressure is 260 kN. The in-situ high pressure neutron diffraction experiments indicate that the PCBN anvil miscellaneous signal was not observed in the high pressure neutron diffraction patterns of iron. By further optimizing the PCBN cell, we expect to obtain a high-quality neutron diffraction patterns under higher pressure than 10 GPa.

关 键 词：高压 原位中子衍射 外凹式 PCBN压砧 

分 类 号：O521.2[理学—高压高温物理]