Improvement of nano-polycrystalline diamond anvil cells with Zr-based bulk metallica glass cylinder for higher pressures: application to Laue-TOF diffractometer
Improvement of nano-polycrystalline diamond anvil cells with Zr-based bulk metallica glass cylinder for higher pressures: application to Laue-TOF diffractometer
复制标题
使用 Zr 基块状金属玻璃圆筒改进纳米多晶金刚石砧池以实现更高的压力：在 Laue-TOF 衍射仪中的应用
DOI：
10.1080/08957959.2022.2045982
复制
发表时间：
2022
影响因子：
2
通讯作者：
H.
中科院分区：
文献类型：
--
作者：
Yamashita;K.;Komatsu;K.;Ohhara;T.;Munakata;K.;Irifune;T.;Shinmei;T.;Sugiyama;K.;Kawamata;T. and Kagi;H.
单晶中子衍射提供有关晶体结构的直接信息，例如氢位置和磁性结构。然而，在高压下进行的原位实验存在诸如衰减校正、寄生衍射掩蔽、样品体积和可接近方向的限制等技术难题。在这项研究中，我们改进了金刚石砧单元，采用由锆基大块金属玻璃制成的管状框架和纳米多晶金刚石砧，用于单晶中子衍射。通过实验证实较厚的管状框架可以稳定产生4.5 GPa。其中子衍射的可行性在 MLF J-PARC BL18 (SENJU) 光束线的 Laue-TOF 衍射仪上使用覆盖宽立体角的时间分辨二维探测器进行了评估。除了 NH4Cl 的环境压力测量之外，还现场收集了冰的高压相的衍射图案。获得的强度具有足以进行结构分析的可精炼质量。
Single-crystal neutron diffraction provides direct information about crystal structures such as hydrogen positions and magnetic structures. However,in-situexperiments conducted under high pressure entail technical difficulties such as attenuation correction, masking of parasitic diffraction, and limitations of sample volumes and accessible directions. For this study, we improved diamond anvil cells with a tubular frame made of Zr-based bulk metallic glass and nano-polycrystalline diamond anvils for single-crystal neutron diffraction. The thicker tubular frame was confirmed through experimentation as stably generating 4.5 GPa. Its feasibility for neutron diffraction was assessed at the Laue-TOF diffractometer at the BL18 (SENJU) beamline in the MLF J-PARC using time-resolved two-dimensional detectors covering wide solid angles. In addition to ambient-pressure measurements of NH4Cl, diffraction patterns of a high-pressure phase of ice were also collectedin-situ. The obtained intensities are of refinable quality sufficient for structure analysis.