Abstract
Sm 2Zr 2O 7 co-doped with and without 5 mol.% Yb 2O 3 and 5 mol.% Gd 2O 3 were prepared by a pressureless-sintering method at 1973 K for 10 h in air. The relative density, structure and electrical conductivity were investigated by the Archimedes method, X-ray diffraction, scanning electron microscopy and impedance spectra measurements. Both Sm 2Zr 2O 7 and (Sm 0.9Gd 0.05Yb 0.05) 2Zr 2O 7 ceramics exhibit a single phase of pyrochlore-type structure. The grain conductivity, grain-boundary conductivity and total conductivity obey the Arrhenius relation, respectively, and gradually increase with increasing temperature from 723 to 1173 K. (Sm 0.9Gd 0.05Yb 0.05) 2Zr 2O 7 ceramic is the oxide-ion conductor in an oxygen partial pressure range of 1.0 × 10 −4 to 1.0 atm at all test temperature levels. The grain conductivity, grain-boundary conductivity and total conductivity of (Sm 0.9Gd 0.05Yb 0.05) 2Zr 2O 7 with dual Yb 3+ + Gd 3+ doping are higher than those of undoped Sm 2Zr 2O 7 at identical temperature levels.
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