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

Research output: Contribution to journalArticlepeer-review

128 Citations (Scopus)


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
Issue number4844
Publication statusPublished - 1988
Externally publishedYes

ASJC Scopus subject areas

  • General


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