Crystallography of low Z material at ultrahigh pressure:Case study on solid hydrogen

查看全文 作　　者：Cheng [1,2]Ji;Bing [1,3]Li;Wenjun [4]Liu;Jesse [5]S.Smith;Alexander [6]Bjoorling;Arnab [7]Majumdar;Wei [7]Luo;Rajeev [7]Ahuja;Jinfu [1]Shu;Junyue [1]Wang;Stanislav [1]Sinogeikin;Yue [5]Meng;Vitali [8]B.Prakapenka;Eran [1]Greenberg;Ruqing [4]Xu;Xianrong [4]Huang;Yang [1]Ding;Alexander [1,9]Soldatov;Wenge [1]Yang;Guoyin [5]Shen;Wendy [10,11]L.Mao;Ho-Kwang [1]Mao

机构地区：[1]Center for High Pressure Science and Technology Advanced Research,Beijing 100094,China;[2]High Pressure Collaborative AccessTeam,Geophysical Laboratory,Carnegie Institution of Washington,Argonne,Illinois 60439,USA;[3]Center for the Study of Matter at Extreme Conditions and Department of Mechanical and Materials Engineering,Florida International University,Miami,Florida 33199,USA;[4]Advanced Photon Source,Argonne National Laboratory,Lemont,Illinois 60439,USA;[5]HPCAT,X-Ray Science Division,Argonne National Laboratory,Lemont,Illinois 60439,USA;[6]MAX IV Laboratory,Lund University,22100 Lund,Sweden;[7]Condensed Matter Theory Group,Materials Theory Division,Department of Physics and Astronomy,Uppsala University,Uppsala S-75120,Sweden;[8]Center for Advanced Radiation Sources,University of Chicago,Chicago,Illinois 60637,USA;[9]Department of Engineering Sciences and Mathematics,Lule°a University of Technology,97187 Lule°a,Sweden;[10]Department of Geological Sciences,Stanford University,Stanford,California 94305,USA;[11]Stanford Institute for Materials and Energy Sciences,SLAC National Accelerator Laboratory,Menlo Park,California 94025,USA

出　　处：《Matter and Radiation at Extremes》索引2020年第5卷第3期,共15页

基　　金：This research was supported by the National Natural Science Foundation of China under Award No.U1930401;the Department of Energy(DOE),Office of Basic Energy Science,Division of Materials Sciences and Engineering under Award No.DE-FG02-99ER45775 摘　　要：Diamond anvil cell techniques have been improved to allow access to the multimegabar ultrahigh-pressure region for exploring novel phenomena in condensedmatter.However,the onlyway to determine crystal structures of materials above 100 GPa,namely,X-ray diffraction(XRD),especially for lowZ materials,remains nontrivial in the ultrahigh-pressure region,even with the availability of brilliant synchrotron X-ray sources.In thiswork,we performa systematic study,choosing hydrogen(the lowest X-ray scatterer)as the subject,to understand how to better perform XRD measurements of low Z materials at multimegabar pressures.The techniques that we have developed have been proved to be effective in measuring the crystal structure of solid hydrogen up to 254GPa at room temperature[C.Ji et al.,Nature 573,558–562(2019)].Wepresent our discoveries and experienceswith regard to several aspects of thiswork,namely,diamond anvil selection,sample configuration for ultrahigh-pressure XRDstudies,XRDdiagnostics for low Z materials,and related issues in data interpretation and pressure calibration.Webelieve that these methods can be readily extended to other low Z materials and can pave the way for studying the crystal structure of hydrogen at higher pressures,eventually testing structural models of metallic hydrogen. 关键词：ultrahigh SOLID eventually

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Crystallography of low Z material at ultrahigh pressure:Case study on solid hydrogen

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