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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 0 K and 19,000 K and at pressures between 15 and 90 megabars. 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 order are included by the quasi-chemical method, and lattice dynamics in the virtual crystal harmonic approximation. We conclude that at temperatures below 4,000 K there is 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
19760023257
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Straus, D. M. (Cornell Univ. Ithaca, NY, United States)
Ashcroft, N. W. (Cornell Univ. Ithaca, NY, United States)
Beck, H. (el univ. switzerland) tions, United States)
Date Acquired
September 3, 2013
Publication Date
June 1, 1976
Subject Category
Metallic Materials
Report/Patent Number
NASA-CR-148578
Accession Number
76N30345
Funding Number(s)
CONTRACT_GRANT: NGR-33-010-188
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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