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Influence of sintering conditions on the electrical properties of 10% ZrO2–10% Y2O3–CeO2 (mol%)

Authors :
G.S. Godoi
D. P. F. de Souza
Source :
Solid State Ionics. 180:1587-1592
Publication Year :
2009
Publisher :
Elsevier BV, 2009.

Abstract

Yttria–zirconia doped ceria, 10% ZrO 2 –10% Y 2 O 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.

Details

ISSN :
01672738
Volume :
180
Database :
OpenAIRE
Journal :
Solid State Ionics
Accession number :
edsair.doi...........8de4aac2b3a99dc622a6c540faf56ccd
Full Text :
https://doi.org/10.1016/j.ssi.2009.10.006