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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。
Based on the high hardness of polycrystalline cubic boron nitride (PCBN) and the good absorption of neutron, PCBN was selected as the material of the anvil. A new type of external concave flat anvil was designed and the surface of the substrate was composed of titanium-zirconium alloy, carbon fiber tube, poly PTFE composition of the composite seal. Using this PCBN pressure chamber, the chamber pressure was calibrated using the transformation points of ZnTe and ZrW2O8, respectively. The results show that when the cavity volume is 9mm3 and the load pressure is 260kN, the pressure in the cavity reaches 9GPa. High-pressure in-situ neutron diffraction experiments show that the high pressure neutron diffraction spectrum of iron without pressure anvil background signal is obtained by adopting concave PCBN cavity. It is expected that by further optimization, high-pressure, high-pressure neutron diffraction spectra can be obtained at higher pressures (above 10 GPa) using PCBN pockets.