Thermoelectric power and ionic molar entropy of solid, vitreous, and molten salts

The determination of the thermoelectric power of cells of solid, vitreous, or molten salts enables the molar entropy of the ionic species exchanged at the electrode to be obtained. This is of interest for polyatomic anion salts in some solid and vitreous electrolytes where the Pitzer relationship between the overall entropy of a simple salt and single-ion contribution to it cannot be used. The proposed procedure applies to cases in which an evaluation of the transport terms in the expression for the overall thermoelectric power is possible. If the molar ionic entropy can be evaluated at various temperatures the corresponding ionic molar heat capacity can be found