Abstract
In this study, effects of neodymium doping on the electrical properties of gadolinium-doped ceria were investigated. Ce0.8Gd0.2−xNdxO1.90 (x = 0.0–0.20) powders were prepared by citrate–nitrate combustion. Phase identification and morphology were carried out by XRD and SEM, respectively. All powder samples calcined at 600 °C were found to be ceria-based solid-solutions with a fluorite-type structure. The powders were isostatically cold-pressed and sintered in air at 1400 °C for 6 h to attain a sintered density of about 95% of the theoretical value. Electrical conductivity of the gadolinium-doped ceria pellets in air was studied as a function of temperature in 300–800 °C temperature range, utilizing two-probe electrochemical impedance spectroscopy. Ce0.80Gd0.12Nd0.08O1.90 showed higher electrical conductivity and lower activation energy (0.64 eV) than single element-doped (Gd or Nd-doped) ceria at 700 °C. Thus, it can be indicated as a possible candidate to function as an electrolyte in intermediate temperature solid oxide fuel cells.
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