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Phase separation of metallic hydrogen-helium alloysCalculations are presented for the thermodynamic functions and phase-separation boundaries of solid metallic hydrogen-helium alloys at temperatures between zero and 19,000 K and at pressures between 15 and 90 Mbar. Expressions for the band-structure energy of a randomly disordered alloy (including third order in the electron-ion interaction) are derived and evaluated. Short- and long-range orders are included by the quasi-chemical method, and lattice dynamics in the virtual-crystal harmonic approximation. It is concluded that at temperatures below 4000 K, there is essentially complete phase separation of hydrogen-helium alloys and that a miscibility gap remains at the highest temperatures and pressures considered. The relevance of these results to models of the deep interior of Jupiter is briefly discussed.
Document ID
19770048871
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Straus, D. M.
(Cornell Univ. Ithaca, NY, United States)
Ashcroft, N. W.
(Cornell University Ithaca, N.Y., United States)
Beck, H.
(Basel, Universitaet Basel, Switzerland)
Date Acquired
August 8, 2013
Publication Date
February 15, 1977
Publication Information
Publication: Physical Review B - Solid State
Subject Category
Inorganic And Physical Chemistry
Accession Number
77A31723
Funding Number(s)
CONTRACT_GRANT: NGR-33-010-188
Distribution Limits
Public
Copyright
Other

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