Atomic Parameters for Ionic Systems

Ionic solids and molten salts are typical ionic systems. Electrolyte solutions are the mixtures of ions and molecules, but may be considered as ionic systems as an approximation if the solvent is considered as a continuous medium [109]. 

So many thermodynamic properties should be some unknown functions of the dimensionless numbers listed in the above-mentioned equation. Since this is a multivariate problem, SVM or other statistical algorithms can be used to find the empirical relationships between the thermod)mamic properties and these dimensionless numbers. 

The crystal type of ionic compound is chiefly determined by the ionic radii of constituent elements. For compounds of definite valence type, the regularities of the crystal types of ionic compounds can be roughly expressed by so-called structure maps [102], as shown by an example in Fig. 5.4. 

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