Linear mixing rule in screened binary ionic mixtures

Details Linear mixing rule in screened binary ionic mixtures Linear mixing rule in screened binary ionic mixtures

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990phrva..42.2284c&link_type=abstract

Physical Review A (ISSN 1050-2947), vol. 42, Aug. 15, 1990, p. 2284-2291.

Physics

17

Binary Mixtures, Coulomb Potential, Linear Equations, Plasma Density, Temperature Dependence, Thermodynamic Properties, Electron Gas, Elementary Particle Interactions, Ionization Coefficients, Neutron Stars, Phase Diagrams, Stellar Structure

Scientific paper

The validity of the linear mixing rule is examined for the following two cases (1) when the response of the electron gas is taken into account in the effective ionic interaction and (2) when finite-temperature effects are included in the dielectric response of the electrons, i.e., when the ions interact with both temperature- and density-dependent screened Coulomb potentials. It is found that the linear mixing rule remains valid when the electron response is taken into account in the interionic potential at any density, even though the departure from linearity can reach a few percent for the asymmetric mixtures in the region of weak degeneracy for the electron gas. A physical explanation of this behavior is proposed which is based on a simple additional length scale.

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