Synchrotron x-ray diffraction measurements of single-crystal hydrogen to 26.5 gigapascals

H. K. Mao, A. P. Jephcoat, R. J. Hemley, L. W. Finger, C. S. Zha, R. M. Hazen, D. E. Cox

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Abstract

The crystal structure and equation of state of solid hydrogen have been determined directly to 26.5 gigapascals at room temperature by new synchrotron x-ray diffraction techniques. Solid hydrogen remains in the hexagonal close-packed structure under these pressure-temperature conditions and exhibits increasing structural anisotropy with pressure. The pressure-volume curve determined from the x-ray data represents the most accurate experimental measurement of the equation of state to date in this pressure range. The results remove the discrepancy between earlier indirect determinations and provide a new experimental constraint on the molecular-to-atomic transition redicted at higher pressures.

Original languageEnglish
Pages (from-to)1131-1134
Number of pages4
JournalScience
Volume239
Issue number4844
DOIs
Publication statusPublished - Jan 1 1988

ASJC Scopus subject areas

  • General

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    Mao, H. K., Jephcoat, A. P., Hemley, R. J., Finger, L. W., Zha, C. S., Hazen, R. M., & Cox, D. E. (1988). Synchrotron x-ray diffraction measurements of single-crystal hydrogen to 26.5 gigapascals. Science, 239(4844), 1131-1134. https://doi.org/10.1126/science.239.4844.1131