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Pressure/temperature fluid cell apparatus for the neutron powder diffractometer instrument: Probing atomic structure in situ

机译:用于中子粉末衍射仪的压力/温度流体池设备:原位探测原子结构

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This contribution describes a new local structure compatible gas/liquid cell apparatus for probing disordered materials at high pressures and variable temperatures in the Neutron Powder Diffraction instrument at the Lujan Neutron Scattering Center, Los Alamos National Laboratory. The new sample environment offers choices for sample canister thickness and canister material type. Finite element modeling is utilized to establish maximum allowable working pressures of 414 MPa at 15 K and 121 MPa at 600 K. High quality atomic pair distribution function data extraction and modeling have been demonstrated for a calibration standard (Si powder) and for supercritical and subcritical CO measurements. The new sample environment was designed to specifically target experimental studies of the local atomic structures involved in geologic CO sequestration, but will be equally applicable to a wide variety of energy applications, including sorption of fluids on nano/meso-porous solids, clathrate hydrate formation, catalysis, carbon capture, and H and natural gas uptake/storage.
机译:该文稿描述了一种新型的局部结构兼容的气/液电池装置,该装置可在洛斯阿拉莫斯国家实验室的卢扬中子散射中心的中子粉末衍射仪中,在高压和可变温度下探测无序的材料。新的样品环境提供了样品罐厚度和罐材料类型的选择。利用有限元建模来建立15 K时最大允许工作压力为414 MPa,在600 K时建立最大允许工作压力。校准标样(硅粉)以及超临界和亚临界的高质量原子对分布函数数据提取和建模已得到证明。 CO测量。新的样品环境旨在专门针对涉及地质CO隔离的局部原子结构的实验研究,但将同样适用于多种能源应用,包括流体在纳米/中孔固体上的吸附,包合物水合物的形成,催化,碳捕获以及H和天然气的吸收/存储。

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