Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1284866 | Journal of Power Sources | 2010 | 5 Pages |
Abstract
SmYb1âxGdxZr2O7 (0 â¤Â x â¤Â 1.0) ceramics were pressureless-sintered at 1973 K for 10 h in air. The relative density, structure and electrical conductivity of SmYb1âxGdxZr2O7 ceramics were investigated by the Archimedes method, X-ray diffraction, scanning electron microscopy and impedance spectroscopy measurements. SmYb1âxGdxZr2O7 (0 â¤Â x â¤Â 0.5) ceramics exhibit a defect fluorite-type structure, while SmYb1âxGdxZr2O7 (0.7 â¤Â x â¤Â 1.0) ceramics have a pyrochlore-type structure. The measured values of the electrical conductivities obey the Arrhenius relation. The grain conductivity of each composition in SmYb1âxGdxZr2O7 ceramics increases with increasing temperature from 723 to 1173 K. The grain conductivity of SmYb1âxGdxZr2O7 ceramics gradually increases with increasing gadolinium content at identical temperature levels. An increase of about one order of magnitude in grain conductivity is found at all temperature levels when the gadolinium content increases from 0.5 to 0.7. SmYb1âxGdxZr2O7 ceramics are oxide-ion conductors in the oxygen partial pressure range of 1.0 Ã 10â4 to 1.0 atm at all test temperature levels. The highest grain conductivity value obtained in this work is 2.69 Ã 10â2 S cmâ1 at 1173 K for SmGdZr2O7 ceramic.
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Zhan-Guo Liu, Jia-Hu Ouyang, Ke-Ning Sun, Xiao-Liang Xia,