The structure, thermal expansion coefficients, and ionic and electronic conductivities of Ce 1 - x Tb x O 2 - δ ( x = 0−0.30) solid solutions, prepared hydrothermally for the first time, were investigated. The uniformly small particle size (33−40 nm) of the hydrothermally prepared materials allows sintering of the samples into highly dense ceramic pellets at 1300−1400 °C, a significantly lower temperature, compared to that at 1600−1650 °C required for samples prepared by solid-state techniques. X-ray absorption near edge spectroscopy was used for the identification of Tb 3+ /Tb 4+ ions. The maximum of total conductivity was found at x = 0.25 (σ 70 0 ° C = 2.1 × 10 - 2 S/cm, E a = 0.49 eV) with electronic contribution to the total conductivity around ∼50% at 600−700 °C. The conductivity becomes more ionic with decreasing Tb substitution. The thermal expansion coefficients, determined from high-temperature X-ray diffraction data, are 11.7 × 10 - 6 K - 1 for CeO 2 and slowly decrease with increasing Tb substitution (10.8 × 10 - 6 K - 1 at x = 0.30).
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Shuk et al. (1999) studied this question.