Pulsed neutron powder diffraction at high pressure by a capacity-increased sapphire anvil cell
Pulsed neutron powder diffraction at high pressure by a capacity-increased sapphire anvil cell
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DOI：
10.1080/08957959.2013.852190
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发表时间：
2013-12
影响因子：
2
通讯作者：
T. Okuchi;Masashi Yoshida;Y. Ohno;N. Tomioka;N. Purevjav;T. Osakabe;S. Harjo;J. Abe;K. Aizawa;S. Sasaki
中科院分区：
文献类型：
--
作者：
T. Okuchi;Masashi Yoshida;Y. Ohno;N. Tomioka;N. Purevjav;T. Osakabe;S. Harjo;J. Abe;K. Aizawa;S. Sasaki
研制了一种用于飞行时间中子粉末衍射的对置顶压室，用于先进的脉冲源。将几个单晶蓝宝石球锤和一个完全硬化的钛锆空合金垫片结合在一起，将35mm3的样品体积分别压缩到1 Gpa和11mm3到2 Gpa的压力。日本质子加速器研究中心对一种有争议的甲烷水合物高压相进行了非常高质量的粉末衍射图。该模式的计数统计量、分辨率、绝对精度和d值范围都得到了改进，最适合于精确的结构细化。在压缩过程中和压缩后，样品是光学可及的，可通过拉曼光谱和荧光光谱进行测量。电流池将是研究在所述压力范围内稳定的复杂结构的含氢材料的替代选择。
A new design of opposed anvil cell for time-of-flight neutron powder diffraction was prepared for use at advanced pulsed sources. A couple of single-crystal sapphire sphere anvils and a gasket of fully hardened Ti–Zr null alloy were combined to compress 35 mm3 of sample volume to 1 GPa and 11 mm3 to 2 GPa of pressures, respectively. A very high-quality powder diffraction pattern was obtained at Japan Proton Accelerator Research Complex for a controversial high pressure phase of methane hydrate. The counting statistics, resolution, absolute accuracy and d-value range of the pattern were all improved to be best suitable for precise structure refinement. The sample is optically accessible to be measured by Raman and fluorescence spectroscopy during and after compression. The current cell will be an alternative choice to study hydrogenous materials of complex structures that are stable at the described pressure regime.