Baroelectric Emf of an ion-conducting solid-state cell: Elementary processes in a loaded open system

The baroelectric emf of an Ag⁺-conducting solid-state cell Ag-Ag₄RbI₅-Ag is investigated. It is shown that, when one of the electrodes of the ion-conducting solid-state cell is loaded, the baroelectric emf of the cell is equal to the sum of the electronic and ionic baroelectric contact potential differences. The electronic (ionic) baroelectric contact potential difference is determined by the work done by the load on changing the electrode volume upon the removal of one electron (ion). The elementary processes responsible for the change in the volume due to the removal of a particle are discussed.