Application of the P.E.M. theory to solid electrolyte pressed powder pellets: Electrically isotropic solid electrolyte particles

The a.c. electrical response of an electrically isotropic solid electrolyte pressed powder pellet, has been calculated using the Percolation Effective Medium Theory (P.E.M.T.) approximation. The pressed powder pellet is represented by a mixture of a conducting phase (solid electrolyte) and an isolation one (air). The physical meaning of the derived results is discussed in reference to a real solid electrolyte pellet response. The pellet response calculated by the P.E.M.T. equation should correspond to the usual ‘bulk’ one. The influence of the microstructure on the pellet response, derived from the model, can be used to improve the ‘bulk’ ionic conductivity, in pressed powder pellets of solid electrolytes with isotropic conductivity, and to obtain its real electrical characteristics.