Phase Diagram of Dense H_{2}-He Mixtures: Evidence for Strong Chemical Association, Miscibility, and Structural Change

Physical Review Letters
Jinhyuk Lim, Choong-Shik Yoo

Abstract

The phase diagram of hydrogen-helium mixtures is presented to 75 GPa, underscoring the formation of metastable H_{2}-rich crystallite in He-rich fluid mixtures and the structural phase transition in He lattice at ∼52  GPa. The Raman data also indicate a significant level of mixing between H_{2} and He even in solids, giving rise to new vibrational bands in He-rich solid at ∼2400  cm^{-1} for H-He stretching and 140  cm^{-1} for the lattice phonon of H_{2} incorporated hcp He. Therefore, the present result signifies unexpected, strong chemical association of the interstitial-filled guest molecules (H_{2} or He) with the host lattice (hcp He or H_{2}) in this quantum solid mixture.

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Citations

Nov 24, 2018·Physical Review Letters·Robin TurnbullRoss T Howie
Mar 25, 2019·The Journal of Chemical Physics·Yu WangAlexander F Goncharov
Feb 24, 2020·The Journal of Chemical Physics·Xingxing JiangYexin Feng

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