An investigation on Structure and Electrical Conductivity of Sm_0.5−xGd_xSr_0.5CoO_3−δ

Abstract

Sm0.5−xGdxSr0.5CoO3−δ (SGSC, x=0, 0.1, 0.2, 0.3, 0.4, 0.5) powders were synthesized by a solution‐combustion method. SGSC formed the major perovskite phase with an orthorhombic symmetry after calcined at 1200°C. The electrical measurements indicated that the Gd3+content have a strong influence on the electrical conductivities of SGSC. It was found that the electrical conductivities of SGSC was firstly increased then decreased as the Gd3+ content changed from 0 to 0.5. The highest electrical conductivity with a value 1820 S/cm was obtained when the amount of Gd reached to 0.2.

Influence of Sintering Temperature on the Electrochemical Performance of Sm_0.5-XGdxSr_0.5Co _3-δ/Gd_0.1Ce_0.9O_1.95 Composite Cathode

“…This should be ascribed to the microstructure. The sintering temperature affects the adhesion of the electrode to the electrolyte and the electrode porosity, thereby the active sites for oxygen reaction [2,[19][20][21]. In addition, the fitting line with single slope suggests that the same reaction mechanism controls the total electrode behavior in the temperature range of 550-750 °C.…”