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

Ji, Cheng ; Li, Bing ; Liu, Wenjun ; Smith, Jesse S. ; Björling, Alexander LU ; Majumdar, Arnab ; Luo, Wei ; Ahuja, Rajeev ; Shu, Jinfu and Wang, Junyue , et al. (2020) In Matter and Radiation at Extremes 5(3).
Abstract

Diamond anvil cell techniques have been improved to allow access to the multimegabar ultrahigh-pressure region for exploring novel phenomena in condensed matter. However, the only way to determine crystal structures of materials above 100 GPa, namely, X-ray diffraction (XRD), especially for low Z materials, remains nontrivial in the ultrahigh-pressure region, even with the availability of brilliant synchrotron X-ray sources. In this work, we perform a 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... (More)

Diamond anvil cell techniques have been improved to allow access to the multimegabar ultrahigh-pressure region for exploring novel phenomena in condensed matter. However, the only way to determine crystal structures of materials above 100 GPa, namely, X-ray diffraction (XRD), especially for low Z materials, remains nontrivial in the ultrahigh-pressure region, even with the availability of brilliant synchrotron X-ray sources. In this work, we perform a 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 254 GPa at room temperature [C. Ji et al., Nature 573, 558-562 (2019)]. We present our discoveries and experiences with regard to several aspects of this work, namely, diamond anvil selection, sample configuration for ultrahigh-pressure XRD studies, XRD diagnostics for low Z materials, and related issues in data interpretation and pressure calibration. We believe 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.

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publishing date
type
Contribution to journal
publication status
published
subject
in
Matter and Radiation at Extremes
volume
5
issue
3
article number
038401
publisher
American Institute of Physics (AIP)
external identifiers
  • scopus:85083724763
ISSN
2468-2047
DOI
10.1063/5.0003288
language
English
LU publication?
yes
id
fe081b9e-60b7-4728-8d11-5fc24ca51c85
date added to LUP
2021-01-05 09:54:34
date last changed
2022-04-26 23:03:19
@article{fe081b9e-60b7-4728-8d11-5fc24ca51c85,
  abstract     = {{<p>Diamond anvil cell techniques have been improved to allow access to the multimegabar ultrahigh-pressure region for exploring novel phenomena in condensed matter. However, the only way to determine crystal structures of materials above 100 GPa, namely, X-ray diffraction (XRD), especially for low Z materials, remains nontrivial in the ultrahigh-pressure region, even with the availability of brilliant synchrotron X-ray sources. In this work, we perform a 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 254 GPa at room temperature [C. Ji et al., Nature 573, 558-562 (2019)]. We present our discoveries and experiences with regard to several aspects of this work, namely, diamond anvil selection, sample configuration for ultrahigh-pressure XRD studies, XRD diagnostics for low Z materials, and related issues in data interpretation and pressure calibration. We believe 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. </p>}},
  author       = {{Ji, Cheng and Li, Bing and Liu, Wenjun and Smith, Jesse S. and Björling, Alexander and Majumdar, Arnab and Luo, Wei and Ahuja, Rajeev and Shu, Jinfu and Wang, Junyue and Sinogeikin, Stanislav and Meng, Yue and Prakapenka, Vitali B. and Greenberg, Eran and Xu, Ruqing and Huang, Xianrong and Ding, Yang and Soldatov, Alexander and Yang, Wenge and Shen, Guoyin and Mao, Wendy L. and Mao, Ho Kwang}},
  issn         = {{2468-2047}},
  language     = {{eng}},
  number       = {{3}},
  publisher    = {{American Institute of Physics (AIP)}},
  series       = {{Matter and Radiation at Extremes}},
  title        = {{Crystallography of low Z material at ultrahigh pressure : Case study on solid hydrogen}},
  url          = {{http://dx.doi.org/10.1063/5.0003288}},
  doi          = {{10.1063/5.0003288}},
  volume       = {{5}},
  year         = {{2020}},
}