Lanthanum-doped ceria powder with a composition Ce0.8La0.2O1.9 was prepared by heating the oxalate solid solution (Ce0.8La0.2)(2)(C2O4)(3) at 873 K in air. As-prepared powder was densified to 96%-97% relative density by sintering in air at 1773 K for 4 h. The electronic current of the disk sample was measured in a temperature range from 773 to 1113 K by the direct current polarization method using a Hebb-Wagner ion-blocking cell. A linear relationship, which was theoretically predicted, was measured between log sigma(c) (electronic conductivity) and E (applied voltage) in the applied voltage range of 0.2-1.0 V. The sigma(e) was proportional to P-O2(-1/4.3) similar to P-O2(-1/4.6) in the oxygen partial pressure range of 10(-2)-10(-8) Pa, and to P-O2(-1/6.7) similar to P-O2(1/7.1) in the oxygen partial pressure range of 10(-7.5)-10(-22) Pa. The apparent activation energy of the electronic conduction was 1.87-1.94 eV. The hole conduction was also measured in the Po-2 range of 10(2)-10(5) Pa. The transport number of oxide ion was 0.96-1.00 at 773-1113 K under an oxygen partial pressure of 10(-5) Pa.