High-pressure phase diagram and equation of state of solid Helium from single-crystal X-Ray diffraction to 23.3 GPa

H. K. Mao, R. J. Hemley, Y. Wu, A. P. Jephcoat, L. W. Finger, C. S. Zha, W. A. Bassett

    Research output: Contribution to journalArticlepeer-review

    109 Citations (Scopus)

    Abstract

    Single-crystal x-ray diffraction measurements have been performed on solid He4 from 15.6 to 23.3 GPa at 300 K with synchrotron radiation. The diffraction patterns demonstrate that the structure of the solid is hexagonal close packed over this pressure-temperature range, contrary to both the interpretation of high-pressure optical studies and to theoretical predictions. The solid is more compressible than is indicated by equations of state calculated with recently determined helium pair potentials. The results suggest that a significant revision of current views of the phase diagram and energetics of dense solid helium is in order.

    Original languageEnglish
    Pages (from-to)2649-2652
    Number of pages4
    JournalPhysical Review Letters
    Volume60
    Issue number25
    DOIs
    Publication statusPublished - 1988

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

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