The alternating-current response of electrically isotropic solid electrolyte pressed-powder pellets was calculated by using the percolation effective medium approximation. The pellet was modelled as a mixture of a conducting phase (solid electrolyte) and an insulating phase (air). The results were compared with those for a real solid electrolyte. The pellet response, as calculated by using the percolation effective medium approximation, was expected to correspond to the usual bulk response. The effect of the microstructure upon the pellet response, as derived from the model, could be used to improve the bulk ionic conductivity of pressed powder pellets of solid electrolytes with an isotropic conductivity.

R.Jimenez: Solid State Ionics, 1996, 90[1-4], 233-44