Synthesis, sintering and conductivity behavior of ceria-doped Scandia-stabilized zirconia

Title
Synthesis, sintering and conductivity behavior of ceria-doped Scandia-stabilized zirconia
Authors
다사리하리안준성안기용박선영홍종섭김형철윤경중손지원이해원이종호
Keywords
SOFC; Scandia-stabilized-zirconia; Ceria; Electrical conductivity; Glycine-nitrate process
Issue Date
2014-10
Publisher
Solid state ionics
Citation
VOL 263, 103-109
Abstract
In this work, the effect of ceria addition on the phase formations, sinterability and electrical conductivity of 10 mol.% scandia stabilized zirconia (SSZ) is investigated. Ceria co-doped SSZ (SSZ–xCeO2 (x = 0.5, 1.0, 5.0 mol.%)) powders were successfully synthesized by glycine-nitrate process and the electrical conductivity was measured in the temperature range of 600–900 °C. Fourier-transform infrared spectroscopy (FT-IR) analysis showed that the samples sintered at 1300 °C/3 h are free from impurities such as un-decomposed nitrates, residual water and nitrile intermediates. From the X-ray diffraction (XRD) analysis, the sintered samples results revealed that the presence of cubic and rhombohedral β-phases and Raman spectroscopy analysis further revealed the presence and monoclinic and tetragonal phases. From the linear shrinkage spectra, a linear shrinkage of 27% was observed at 1300 °C for SSZ and was decreased with the increase of cerium oxide content. The electrical conductivity has been decreased with the increase of ceria content and the SSZ–0.5CeO2 sample displayed a higher electrical conductivity compared to others indicating that as small as 0.5 mol.% CeO2 doping in SSZ is enough to ensure good conductivity results for its potential application as an electrolyte material in intermediate-temperature solid oxide fuel cells (IT-SOFCs).
URI
http://pubs.kist.re.kr/handle/201004/47704
ISSN
01672738
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KIST Publication > Article
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