ABSTRACT

We applied Kawai-type multi-anvil assemblies (MA6-8) for time-of-flight neutron-diffraction experiments to achieve high-pressures and high-temperatures simultaneously. To achieve sufficient signal intensities, the angular access to the sample was enlarged using slits and tapers on the first-stage anvils. Using SiC-binder sintered diamond for the second-stage anvils that transmits neutrons, sufficient signal intensities were achieved at a high-pressure of ∼23.1 GPa. A high-temperature experiment was also conducted at 16.2 GPa and 973 K, validating the use of tungsten carbide for the second-stage anvils. The present study reveals the capability of the MA6-8 cells in neutron-diffraction experiments to attain pressures and temperatures beyond the limits of the conventional MA6-6 cells used in the high-pressure neutron diffractometer PLANET at the MLF, J-PARC.

摘要

我们将Kawai型多砧组件（MA6-8）用于飞行时间中子衍射实验，以同时实现高压和高温。为了获得足够的信号强度，在第一级砧座上使用狭缝和锥度扩大了样品的角接触范围。使用SiC粘结剂烧结的金刚石作为第二级传递中子的砧，在约23.1 GPa的高压下可获得足够的信号强度。还进行了16.2 GPa和973 K的高温实验，验证了碳化钨在第二级砧中的使用。本研究揭示了中子衍射实验中MA6-8细胞获得的压力和温度超出了美国MLF高压中子衍射仪PLANET中使用的常规MA6-6细胞极限的能力，