The effect of platinum impregnation on the ionic conductivity of yttria stabilized zirconia (YSZ) has been determined using complex impedance measurements in the frequency range 10(1)-10(7) Hz. Ionic conductivities and the corresponding activation enthalpies are reported for the temperature range 200-600 degrees C. Platinum agglomerated at the grain boundaries of polycrystalline samples reduces ion transport across the intergranular zone. The evaporation Impregnated Stabilized Zirconia in Bulk and recondensation of YSZ and the addition of Pt results in porous materials and Microporous Materials with improved oxygen ion conductivity.