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Compression behavior of dense H2-He mixtures up to 160 GPa

Journal Article · · Physical Review B
 [1];  [1];  [1];  [2];  [2];  [3];  [4];  [5];  [1]
  1. Washington State Univ., Pullman, WA (United States)
  2. Japan Synchrotron Radiation Research Institute (JASRI) (Japan)
  3. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
  4. Carnegie Inst. of Science, Argonne, IL (United States). High Pressure Collaborative Access Team (HPCAT); Argonne National Lab. (ANL), Argonne, IL (United States)
  5. Univ. of Saskatchewan, Saskatoon, SK (Canada)
+ Show Author Affiliations

We have studied the compression behavior of H2-He mixtures in comparison with pure H2 and He using powder synchrotron x-ray diffraction and present the pressure-volume (PV) compression data of H2-He mixtures to 160 GPa. The results indicate that both H2 and He in H2-He mixtures remain in hcp to the maximum pressure studied, yet develop a substantial level of lattice distortion in the (100) plane, most profound in He-rich solids and below 66 GPa. The measured PV data also indicate softening of He (or H2)-rich lattice upon increasing the level of the guest H2 (or He) concentration. We suggest that the observed softening and lattice distortion are due to a substitutional incorporation of H2 (guest) molecules into the basal plane of hcp-He (host) lattice and, thereby, reflect the miscibility between H2 and He in H2-He mixtures. Interestingly, solid He exhibits a lesser degree of preferred orientation in H2-He mixtures than in pure He, likely due to the presence of solid H2 disturbing the crystalline ordering of He-rich solids. Finally, the present PV compression data of H2-rich and He-rich solids to 160 GPa deviate from those of pure H2 and pure He above ~70 and 45 GPa respectively, providing new constraints for development of the EOS for H2-He mixtures for planetary models.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1663380
Alternate ID(s):
OSTI ID: 1770362
Journal Information:
Physical Review B, Journal Name: Physical Review B Journal Issue: 22 Vol. 101; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
Core of giant planets
Phase transitions
Pressure effects
X-ray diffraction