Electrochemical properties of ZrO2-Y2O3-TiO2 ceramics

The electrical conductivity of (0.98-x)ZrO2 . 0.02Y(2)O(3) . xTiO(2) ceramic samples in the composition range x = 0.04-0.60 was measured in the temperature range 600-900 degrees C and at 0.1 Pa oxygen partial pressure. Both the d.c. four-probe and the a.c. impedance spectroscopy method were applied. The electronic conductivity at 800 degrees C was measured by the d.c. polarization technique. The ionic transport in the samples was determined using appropriate solid-state galvanic cells in the temperature range 800-1000 degrees C. The samples consisting of monoclinic and tetragonal zirconia (x = 0.04-0.13) appeared to be practically pure ionic conductors. The samples containing zirconium titanate as a main phase exhibited a mixed ionic-electronic conduction.