Well dispersed Ce1-xTbxO2-delta nano-powders were synthesized by using the carbonate coprecipitation method in an entire compositional range of 0 <= x <= 1, which allowed the preparation of highly dense pellets by sintering at 1673 K and the systematical study of the electrical conductivity in such a wide compositional range. It was found that the conductivity increased with increasing Tb concentration except that of x = 0.80. Secondary phase were observed by using X-ray diffraction in the samples with x >= 0.80, which might have negative impact on the conductivity of the samples. (c) 2007 Elsevier Ltd. All rights reserved.