Abstract
Single-phase solid solutions of Sm2 − x Ce x CuO4 + δ (0.05 ≤ x ≤ 0.20) with tetragonal structure are synthesized using acetate combustion followed by sintering at 1373 K for 10 h. X-ray powder diffraction and transmission electron microscopy studies confirmed the formation of solid solution in a single phase. Maximum conductivity (σ = 96.0 ± 0.5 S cm−1 at 973 K) giving composition Sm1.90Ce0.10CuO4 offers the minimum activation energy (E a = 0.32 ± 0.004 eV) among all prepared compositions. Lowest cathode polarization resistance (R p = 3.92 ± 0.07 Ω cm2 at 973 K) and activation energy (E a = 1.12 ± 0.03 eV) values across the measured temperature range are obtained for Sm1.90Ce0.10CuO4. The impedance data fitted well to the Gerischer model indicates that a chemical-electrochemical-chemical-type reaction occurred at the mixed electronic-ionic conducting cathode.
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