CeO2 based materials doped with lanthanides for applications in intermediate temperature electrochemical devices

• DOI: 10.1016/j.ijhydene.2011.01.132
• Publication Date: 2011-04-14T20:06:23Z
• Authors: E.Yu. Pikalova; A.A. Murashkina; V.I. Maragou; A.K. Demin; V.N. Strekalovsky; P.E. Tsiakaras
• Keywords: 02 engineering and technology; 0210 nano-technology

Abstract The present work aims at the investigation of the influence of different dopants’ ionic radius and concentration on the lattice parameters and the density of Ce1−xLnxO2−δ (x = 0–0.20; Ln = La, Nd, Sm, Eu, Gd, Dy, Ho, Er, Yb) solid solutions. Moreover, the temperature dependence of the linear expansion of Ce0.8Ln0.2O2−δ ceramics is examined in the range of 300–1173 K and the respective thermal expansion coefficients are calculated. Finally, the total electrical conductivity of Ce1−xLnxO2−δ (x = 0.15–0.20) and multi-component Ce(1−x)Lnx/2Ln’x/2O2−δ (x = 0.20; Ln = Sm, La, Gd, Dy and Ln’ = Dy, Nd, Er, Y) systems is studied in a wide range of temperatures in air atmosphere, as well as in a wide range of oxygen partial pressures at 1023 K and 1173 K. According to the experimental results of the present work, at the highest examined temperature of 1173 K and in air atmosphere, the maximum values of total electrical conductivity are observed in the cases of Ce0.8Nd0.2O2−δ and Ce0.8Sm0.2O2−δ.