Phase Diagram of Dense H_{2}-He Mixtures: Evidence for Strong Chemical Association, Miscibility, and Structural Change
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...
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| Published in | Physical review letters Vol. 120; no. 16; p. 165301 |
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| Main Authors | , |
| Format | Journal Article |
| Language | English |
| Published |
United States
20.04.2018
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| Online Access | Get more information |
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| Summary: | 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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| ISSN: | 1079-7114 |
| DOI: | 10.1103/PhysRevLett.120.165301 |