T 44 The effect of co-dopant addition on the properties of LN0.2CE0.8O2-δ (LN = GD, SM, LA) solid-state electrolyte / E. Yu. Pikalova , A. N. Demina , A. K. Demin , V. I. Maragou , P. E. Tsiakaras // Journal of Power Sources. - 2008. - Vol. 181, № 2. - С. 199-206.
Кл.слова (ненормированные): ЭЛЕКТРОПРОВОДНОСТЬ -- ЩЕЛОЧНОЗЕМЕЛЬНЫЕ МЕТАЛЛЫ -- ЛЕГИРОВАНИЕ Аннотация: The present work aims at the investigation of Ln0.2Ce0.8O2−δ (where Ln = Sm, La, Gd) structural and electrical properties when in the Ln sub-lattice, Ba2+ and Sr2+ with ionic radii 1.42 and 1.26 Å, respectively, are introduced. The conductivity measurements were held both in air and in H2 + 3%H2O atmosphere using the 4-probe dc technique at the temperature range of 600–900 °C. Among all the samples, the highest value of electrical conductivity is obtained in the case of (Sm0.75Sr0.2Ba0.05)0.2Ce0.8O2−δ, both in air and in hydrogen atmosphere. In the case of H2 + 3%H2O the conductivity of the co-doped compounds increases in comparison with air. Moreover, the dependence of conductivity on the oxygen partial pressure, measured at the range of 0.21–10−22 atm, showed that the electrolytic area of alkaline-earth metals doped Ln0.2Ce0.8O2−δ is considerably enhanced, as predicted by the theory. Finally, by comparing the thermal expansion coefficients of the different materials (TEC), the thermo-mechanical compatibility between the co-doped and the other cell components was also investigated. |