Abstract
Rare earth-doped ceria ceramics are potential candidates for an electrolyte in medium-temperature solid oxide fuel cells (SOFC). However, the mechanical properties under the practical working environments of SOFCs have not been not fully investigated for CeO2 based electrolytes. In this study, creep behaviors of CeO2-YO1.5 were investigated at stresses of 20–39 MPa and temperatures of 1045 to 1125°C under controlled oxygen partial pressure (PO2). The stress exponent n≈0.96 and the activation energy Q≈264 kJ/mol of creep rate were obtained experimentally in air. Because this value is much higher than that for anion diffusion in this material, it was concluded that creep is controlled by a cation diffusion mechanism. It was found that the oxygen partial pressure dependence of the steady-state strain rate has a peak at PO2=10−14 atm and the profile is similar to electrical conductivity.
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