High-Pressure Phase Diagram and Equation of State of Solid Helium from Single-Crystal X-Ray Diffraction to 23.3 GPa
H. K. MaoGeophysical Laboratory, Carnegie Institution of Washington, Washington, D.C. 20008Russell J. HemleyGeophysical Laboratory, Carnegie Institution of Washington, Washington, D.C. 20008Yan WuCenter for X-Ray Optics, Lawrence Berkeley Laboratory, Berkeley, California 94720A. P. JephcoatGeophysical Laboratory, Carnegie Institution of Washington, Washington, D.C. 20008L. W. FingerGeophysical Laboratory, Carnegie Institution of Washington, Washington, D.C. 20008Chang‐Sheng ZhaGeophysical Laboratory, Carnegie Institution of Washington, Washington, D.C. 20008William A. BassettDepartment of Geological Sciences, Cornell University, Ithaca, New York 14853
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Single-crystal x-ray diffraction measurements have been performed on solid $^{4}\mathrm{He}$ 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.
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