The Ce0.8Sm0.2O2−δ, Ce0.8Nd0.2O2−δ and Ce0.8Sm0.1Nd0.1O2−δ samples were prepared

by using a citrate sol–gel method. The effects of the microstructures and the

oxygen vacancies of the samples upon their electrical properties were investigated via X-ray diffraction, scanning electron microscopy, in situ Raman spectroscopy

and AC impedance spectroscopy. The scanning electron microscopy results

indicated that larger grains were formed on the Ce0.8Nd0.2O2−δ and

Ce0.8Sm0.1Nd0.1O2−δ electrolytes compared to the Ce0.8Sm0.2O2−δ. In situ Raman

spectra suggested that the concentration of oxygen vacancies of the

Ce0.8Sm0.1Nd0.1O2−δ sample was the highest while that of Ce0.8Sm0.2O2−δ was the

lowest. It was found that the difference in the electrical conductivities of these

electrolytes was closely related to the microstructure and oxygen vacancies of the

samples. The highest electrical conductivity obtained on the Ce0.8Sm0.1Nd0.1O2−δ

sample was ascribed to its larger grain size and higher concentration of oxygen

vacancies.

Effect of Oxygen Vacancies on Electrical Properties of Ce0.8Sm0.1Nd0.1O2−δ

Electrolyte: an in situ Raman Spectroscopic Study. S.P.Li, J.Q.Lu, P.Fang,

M.F.Luo: Journal of Power Sources, 2009, 193[1], 93-8