Influence of sintering conditions on the electrical properties of 10% ZrO 2–10% Y 2O 3–CeO 2 (mol%)

Yttria–zirconia doped ceria, 10% ZrO 2–10% Y 2O 3–CeO 2 (mol%) (CZY) and 0.5 mol% alumina-doped CZY (CZYA), prepared through oxide mixture process, were sintered by isothermal sintering (IS) and two-step sintering (TSS) having as variable the temperature and soaking time. The electrical conductivity...

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Bibliographic Details
Published inSolid state ionics Vol. 180; no. 36; pp. 1587 - 1592
Main Authors Godoi, G.S., De Souza, D.P.F.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 2009
Subjects
Doped ceria
Electrical conductivity
Microstructure
SOFC
Electrical conductivity
Doped ceria
Microstructure
SOFC
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Summary:Yttria–zirconia doped ceria, 10% ZrO 2–10% Y 2O 3–CeO 2 (mol%) (CZY) and 0.5 mol% alumina-doped CZY (CZYA), prepared through oxide mixture process, were sintered by isothermal sintering (IS) and two-step sintering (TSS) having as variable the temperature and soaking time. The electrical conductivity of sintered samples was investigated in the 250 to 600 °C temperature range by impedance spectroscopy in air atmosphere. The microstructure was analyzed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Alumina, as additive, improves the grain boundary conductivity of samples sintered at temperatures lower than 1500 °C. Concerning the sintering mode, two-step sintering (TSS) proved to be a good procedure to obtain CZYA samples with high electrical conductivity and density (> 95%) at relatively low sintering temperature and long soaking time.
ISSN:0167-2738
1872-7689
DOI:10.1016/j.ssi.2009.10.006