Ionic Transport Entropy in Nonisothermal Molten Silver Chloride Cells

The determination of the emf of the nonisothermal cells and is used to estimate the magnitude of the transport entropy terms in the general equation for thermogalvanic potentials. The emf's were determined over the temperature range 500°–900°C with temperature differentials ranging from 40° to 400°C. The limits of accuracy of the measurement are established by reference to accurately known reversible thermodynamic quantities; the irreversible quantities are demonstrated to be small, but not negligible as they were reported to be in solid electrolyte cells; and the Seebeck coefficient's independence of the transport numbers in the system was experimentally confirmed.