Abstract
The effects of Sr doping on the electrical properties of Ce0.75(Gd0.95−xSrxCa0.05)0.25O2−δ (x=0, 0.01, 0.02, 0.03, 0.04, 0.05mol%) electrolytes thick films were investigated. The samples sintered at 1400°C for 8h. X-ray diffraction (XRD) showed typical XRD patterns of a cubic fluorite structure, and the ionic conductivity was examined by AC impedance spectroscopy. From the experimental results, it was observed that Ce0.75(Gd0.95−xSrxCa0.05)0.25O2−δ (x=0.04mol%) electrolytes thick film have higher conductivity and minimum activation energy at 600°C. This is explained in terms of the increased in the oxygen vacancy concentration at the grain boundary.
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