EVALUATION OF IONIC TRANSPORT NUMBER OF CEO2 DOPED Y-TZP AND PSZ CERAMICS WITH ALUMINA ADDITIONS

Different zirconia-based composite materials, one TZP (3Ce-TZP) and two PSZ (1Ce-PSZ and 2Ce-PSZ) with 10 wt% Al2O3 additions, were studied with respect to electrical transport properties. Ionic transport number determinations and ac conductivity results as a function of oxygen partial pressure and temperature indicated that these compositions are ionic conductors within a large range of working conditions. The TZP composition exhibited the largest ionic conductivity and pure ionic behavior in air, from 800-degrees to 1100-degrees-C. In PSZ materials the presence of significant amounts of cubic phase and/or the presence of some monoclinic phase may be responsible for the observed low ionic transport numbers.