ABSTRACT To understand the practical effects of pressure-transmitting media (PTM) on neutron diffraction using Paris–Edinburgh presses, diffraction patterns of MgO were collected to approximately 20 GPa using PTMs of Pb, AgCl, 4:1 methanol–ethanol (ME) mixture with and without heating, N2, and Ar. Hydrostaticity in the sample chamber estimated from the MgO 220 peak width improves in the order of Pb, AgCl, Ar, ME mixture, N2, and the heated ME mixture. Unlike previous results using diamond anvil cells, the unheated ME mixture is superior to Ar even after freezing, probably due to the cup on the anvil face. Considering these results and the sizable coherent scattering of Ne, which would show good hydrostaticity, we conclude that the ME mixture (preferably the heated one) is the best PTM in neutron experiments up to 20 GPa, while Ar can be substituted when a sample is reactive to alcohols.

中文翻译：

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压力传输介质对使用巴黎-爱丁堡压力机进行中子衍射实验的实际影响

摘要 为了了解压力传输介质 (PTM) 对使用巴黎-爱丁堡压机进行中子衍射的实际影响，使用 Pb、AgCl、4:1 甲醇 - 乙醇 (ME) 混合物的 PTM 将 MgO 的衍射图收集到大约 20 GPa加热和不加热、N2 和 Ar。根据 MgO 220 峰宽估计的样品室中的流体静力按 Pb、AgCl、Ar、ME 混合物、N2 和加热的 ME 混合物的顺序改进。与之前使用金刚石砧座的结果不同，未经加热的 ME 混合物即使在冷冻后也优于 Ar，这可能是由于砧面上的杯子。考虑到这些结果和 Ne 的相当大的相干散射，这将显示出良好的流体静力学，我们得出结论，ME 混合物（最好是加热的混合物）是高达 20 GPa 的中子实验中最好的 PTM，