THERMOPOWER OF AN ASYMMETRIC CELL, AG-VERTICAL-BAR-AGI-VERTICAL-BAR-AG2S, INVOLVING A MIXED CONDUCTOR AG2S AS AN INFORMATION TRANSMITTER

We have examined both theoretically and experimentally the thermopower of an asymmetric thermocell, Ag/alpha-AgI/Ag2S, which involves a mixe d conductor (Ag2S) as a possible electrode for the system of an electr olyte with common ions (AgI). It has been found that the mixed conduct or probe allows one to measure the thermopower of the electrolyte unde r the Soret equilibrium condition which would be impossible to realize in a symmetric thermocell, Ag/alpha-AgI/Ag. Upon comparison of the st ationary state thermopowers from the symmetric and asymmetric cells, t he transported entropy of Ag in AgI turns out to be equal to the stand ard entropy of metallic Ag.