Abstract
A novel series of Gd 1− x Eu 2 x Sm 1− x Zr 2O 7 ( x = 0, 1/3, 1/2, 2/3, 1) ceramics with a constant lattice parameter are prepared by solid-state reaction, and are then evaluated as possible solid electrolytes. The microstructure and electrical properties of Gd 1− x Eu 2 x Sm 1− x Zr 2O 7 ceramics have been investigated by means of X-ray diffraction (XRD), scanning electron microscopy (SEM) and complex impedance analysis. Gd 1− x Eu 2 x Sm 1− x Zr 2O 7 ceramics exhibit a single phase of pyrochlore-type structure. The total conductivity of Gd 1− x Eu 2 x Sm 1− x Zr 2O 7 ceramics obeys the Arrhenius relation, and gradually increases with increasing temperature from 723 to 1173 K. At 973–1173 K, the composition has little effect on electrical conductivity of Gd 1− x Eu 2 x Sm 1− x Zr 2O 7 ceramics. Gd 1− x Eu 2 x Sm 1− x Zr 2O 7 ceramics are oxide-ion conductors in the oxygen partial pressure range of 1.0 × 10 −4 to 1.0 atm at all test temperature levels. The maximum total conductivity of Gd 1− x Eu 2 x Sm 1− x Zr 2O 7 ceramics is about 1.01 × 10 −2 S cm −1 at 1173 K in air.
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