Equation of state for partially ionized carbon and oxygen mixtures at high temperatures

Journal Article · Tue Nov 15 04:00:00 EST 2011 · Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics (Print)

DOI:https://doi.org/10.1103/PHYSREVE.84.056406· OSTI ID:21612322

Massacrier, Gerard ^[1]; Potekhin, Alexander Y ^[1]; Chabrier, Gilles ^[2]

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1. Universite de Lyon, Lyon FR-69003, France, Universite Lyon I, Observatoire de Lyon, Saint-Genis-Laval FR-69230 (France)
2. Ecole Normale Superieure de Lyon, CNRS, UMR 5574, Centre de Recherche Astrophysique de Lyon FR-69007 (France)

The equation of state (EOS) for partially ionized carbon, oxygen, and carbon-oxygen mixtures at temperatures 3x10{sup 5} K < or approx. T < or approx. 3x10{sup 6} K is calculated over a wide range of densities, using the method of free energy minimization in the framework of the chemical picture of plasmas. The free energy model is an improved extension of our model previously developed for pure carbon [Potekhin, Massacrier, and Chabrier, Phys. Rev. E 72, 046402 (2005)]. The internal partition functions of bound species are calculated by a self-consistent treatment of each ionization stage in the plasma environment taking into account pressure ionization. The long-range Coulomb interactions between ions and screening of the ions by free electrons are included using our previously published analytical model, recently improved, in particular for the case of mixtures. We also propose a simple but accurate method of calculation of the EOS of partially ionized binary mixtures based on detailed ionization balance calculations for pure substances.

• OSTI ID: 21612322
• Journal Information: Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics (Print), Journal Name: Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics (Print) Journal Issue: 5 Vol. 84; ISSN 1539-3755
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BINARY MIXTURES
CARBON
DISPERSIONS
ELECTRONS
ELEMENTARY PARTICLES
ELEMENTS
ENERGY
EQUATIONS
EQUATIONS OF STATE
FERMIONS
FREE ENERGY
FUNCTIONS
IONIZATION
LEPTONS
MINIMIZATION
MIXTURES
NONMETALS
OPTIMIZATION
OXYGEN
PARTITION FUNCTIONS
PHYSICAL PROPERTIES
PLASMA
TEMPERATURE RANGE
TEMPERATURE RANGE OVER 4000 K
THERMODYNAMIC PROPERTIES