Conductivity of porous Sm2O3-doped CeO2 as a function of temperature and oxygen partial pressure

Porous samples of Sm2O3-doped CeO2 (samaria-doped ceria, SDC) of composition Sm0.15Ce0.85O2−δ were made by conventional ceramic processing and sintering in air at 1400°C. Crystal structure and microstructure of the samples were characterized, respectively, by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Electrical conductivity was measured using a four probe DC method over a temperature range from 200°C to 800°C, and over a …