Abstract
The author develops a thermodynamic fluctuation theory for mixtures of finite size ions embedded in a responsive neutralising background of electrons. He characterises the electron gas response through a generalised dielectric function and an associated screening length for which a long-wavelength sum rule is obtained. He shows that, in the case of partially stripped ions, the presence of bound electrons induces an electrostrictive behaviour in the response of the system. The screening length and the correlation length for the ions is also calculated. Furthermore the author obtains long-wavelength expressions for the partial structure factors in the case of rigid as well as responsive backgrounds.
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