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Structural parameters and oxygen ion conductivity of Y2O3–ZrO2 and MgO–ZrO2 at high temperature

The oxygen ion conductivity of zirconia-based solid electrolytes doped with 8mol% Y2O3–ZrO2 (YSZ) and 9mol% MgO–ZrO2 (Mg-PSZ) at high temperature was investigated in terms of their thermal behavior and structural changes. At room temperature, YSZ showed a single phase with a fluorite cubic structure...

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Published in:Ceramics international 2013-12, Vol.39 (8), p.9247-9251
Main Authors: Yoon, Sanghyeon, Noh, Taimin, Kim, Wook, Choi, Joo, Lee, Heesoo
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Language:English
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description The oxygen ion conductivity of zirconia-based solid electrolytes doped with 8mol% Y2O3–ZrO2 (YSZ) and 9mol% MgO–ZrO2 (Mg-PSZ) at high temperature was investigated in terms of their thermal behavior and structural changes. At room temperature, YSZ showed a single phase with a fluorite cubic structure, whereas Mg-PSZ had a mixture of cubic, tetragonal and some monoclinic phases. YSZ exhibited higher ionic conductivity than Mg-PSZ at temperatures from 600°C to 1250°C because of the existence of the single cubic structure and low activation energy. A considerable increase in the conductivity with increasing temperature was observed in Mg-PSZ, which showed higher ionic conductivity than YSZ within the higher temperature range of 1300–1500°C. A monoclinic-to-tetragonal phase transformation was found in Mg-PSZ and the lattice parameter of the cubic phase increased at 1200°C. The phase transformation and the large lattice free volume contributed to the significant enhancement of the ionic conductivity of Mg-PSZ at high temperatures.
doi_str_mv 10.1016/j.ceramint.2013.05.032
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subjects B. X-ray methods
C. Ionic conductivity
Ceramics
D. ZrO2
Ionic conductivity
Lattice parameters
Lattices
Magnesium
Phase transformations
Solid electrolytes
Structural change
Yttria stabilized zirconia
title Structural parameters and oxygen ion conductivity of Y2O3–ZrO2 and MgO–ZrO2 at high temperature
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