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

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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
Externally publishedYes

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Mao, H. K., Hemley, R. J., Wu, Y., Jephcoat, A. P., Finger, L. W., Zha, C. S., & Bassett, W. A. (1988). High-pressure phase diagram and equation of state of solid Helium from single-crystal X-Ray diffraction to 23.3 GPa. Physical Review Letters, 60(25), 2649-2652. https://doi.org/10.1103/PhysRevLett.60.2649