Properties of Al < inf > 2 < /inf > O < inf > 3 < /inf > -Sm < inf > 2 < /inf > O < inf > 3 < /inf > -CeO < inf > 2 < /inf > electrolyte

Abstract

Ce 1-xSm xO 2 (x=0, 0.1, 0.2 and 0.3) and Sm-doped ceria+(2-8)Al 2O 3 were synthesized through sol-gel process followed by low temperature combustion. The synthesis, structure, densification, conductivity and thermal expansion were studied, and the structure and phase were confirmed by XRD. Dense ceramics were obtained through sintering the pellets at 1300 °C. 2 and 4 Al 2O 3 were added into Ce 0.8Sm 0.2O 2 to promote the densification at 1250 °C. The surface morphology of the sintered pellets was analyzed using SEM. A two-probe AC impedance spectroscopy was used to study the total ionic conductivity. © 2012 The Nonferrous Metals Society of China.