The densification behavior and electrical conductivity of Ce0.8Y0.2O1.9 ceramics with lithium oxide concentrations ranging from0 to 7 mol% were investigated. The sintered density was found to increase with increasing Li2Ocontent up to 2 mol% and thento decrease somewhat upon further Li2O addition. It was possible to obtain dense Ce0.8Y0.2O1.9 ceramics with 97% of thetheoretical density using a 2 mol% Li2O-added specimen sintered at 1300 oC for 5 hrs, whereas pure Ce0.8Y0.2O1.9 ceramicsneeded to be sintered at 1550 oC in order to obtain an equivalent theoretical density. The electrical conductivity was measuredas a function of the dopant content over the temperature range 450 oC ~ 700 oC in air. The conductivity of the 2 mol% Li2Oaddedspecimen showed a maximum value of 1.15 × 10−2 Ω−1·cm−1at 700. The introduction of Li2O doping had a good effecton the sintering properties and electrical conductivities of Y2O3-doped CeO2.

Keywords: Yttria-doped ceria, Li2Oaddition, Sintering, Electrical conductivity