Abstract
Several compositions of NdYb 1− x Gd x Zr 2O 7 (0 ≤ x ≤ 1.0) ceramics were prepared by pressureless-sintering method at 1973 K for 10 h in air. The relative density, microstructure and electrical conductivity of NdYb 1− x Gd x Zr 2O 7 ceramics were analyzed by the Archimedes method, X-ray diffraction, scanning electron microscopy and impedance plots measurements. NdYb 1− x Gd x Zr 2O 7 (0 ≤ x ≤ 0.3) ceramics have a single phase of defect fluorite-type structure, and NdYb 1− x Gd x Zr 2O 7 (0.7 ≤ x ≤ 1.0) ceramics exhibit a single phase of pyrochlore-type structure; however, the NdYb 0.5Gd 0.5Zr 2O 7 composition shows mixed phases of both defect fluorite-type and pyrochlore-type structures. The measured values of the grain conductivity obey the Arrhenius relation. The grain conductivity of each composition in NdYb 1− x Gd x Zr 2O 7 ceramics gradually increases with increasing temperature from 673 to 1173 K. NdYb 1− x Gd x Zr 2O 7 ceramics are oxide-ion conductor in the oxygen partial pressure range of 1.0 × 10 −4 to 1.0 atm at all test temperature levels. The highest grain conductivity value obtained in this work is 1.79 × 10 −2 S cm −1 at 1173 K for NdYb 0.3Gd 0.7Zr 2O 7 composition.
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