Abstract
In this work, the perovskite oxides Ln0.8Sr0.2Cu0.9Fe0.1O2.5-δ (LSCF, Ln=La, Pr, Nd, Sm, Gd) are successfully synthesized by a pechini-type gel method. The crystal structures and the thermal stabilities of these oxides are characterized using powder X-ray diffraction (XRD) and differential thermal analysis (DTA), respectively. The results indicate that the major perovskite phase is formed after sintering at 800 oC, and the LSCF perovskite is thermodynamically stable and chemically compatible to Sm0.2Ce0.8O1.9 electrolyte below 1000 oC. The result from the electrical conductivity measured by the four-probe D.C. method shows that, as the ionic radius of Ln3+ decreases, the electrical conductivity decreases from 632.7 S cm−1 for La0.8Sr0.2Cu0.9Fe0.1O2.5-δ to a low value of 14.7 S cm−1 for Gd0.8Sr0.2Cu0.9Fe0.1O2.5-δat 700 oC.
Published Version
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