Abstract
A series of zirconate compounds with the general formula Sm 2– x La x Zr 2O 7 (0 ⩽ x ⩽ 1.0) were prepared by pressureless-sintering method at 1973 K for 10 h in air. The relative density, structure and electrical conductivity of Sm 2– x La x Zr 2O 7 ceramics were investigated by the Archimedes method, X-ray diffraction and impedance spectroscopy measurements. Sm 2– x La x Zr 2O 7 (0 ⩽ x ⩽ 1.0) ceramics exhibit a pyrochlore-type structure. The measured electrical conductivity of Sm 2– x La x Zr 2O 7 ceramics obeys the Arrhenius relation and gradually increases with increasing temperature from 673 to 1173 K. Sm 2– x La 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 electrical conductivity of Sm 2– x La x Zr 2O 7 ceramics decreases with increasing lanthanum content at identical temperature levels.
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