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Synthesis and sintering of rare-earth-doped ceria powder by the oxalate coprecipitation method

Published online by Cambridge University Press:  31 January 2011

Kenji Higashi ,
Kazutoshi Sonoda ,
Hiroshi Ono ,
Soichiro Sameshima  and
Yoshihiro Hirata
Kenji Higashi
Affiliation:
Department of Applied Chemistry and Chemical Engineering, Kagoshima University, 1–21–40 Korimoto, Kagoshima 890–0065, Japan
Kazutoshi Sonoda
Affiliation:
Department of Applied Chemistry and Chemical Engineering, Kagoshima University, 1–21–40 Korimoto, Kagoshima 890–0065, Japan
Hiroshi Ono
Affiliation:
Department of Applied Chemistry and Chemical Engineering, Kagoshima University, 1–21–40 Korimoto, Kagoshima 890–0065, Japan
Soichiro Sameshima
Affiliation:
Department of Applied Chemistry and Chemical Engineering, Kagoshima University, 1–21–40 Korimoto, Kagoshima 890–0065, Japan
Yoshihiro Hirata
Affiliation:
Department of Applied Chemistry and Chemical Engineering, Kagoshima University, 1–21–40 Korimoto, Kagoshima 890–0065, Japan
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Abstract

Doped ceria, which has a higher oxygen ion conductivity than yttria-stabilized zirconia, is one of the possible electrolytes for solid oxide fuel cell at low temperatures. This study concerns powder preparation and densification of rare-earth-doped ceria. Rare-earth-doped ceria powders with a composition of Ce0.8R0.2O1.9 (R = Yb, Y, Gd, Sm, Nd, and La) were prepared by heating the oxalate coprecipitate when a mixed rare earth/cerium nitrate solution was added to an oxalic solution. The oxalate and derived-oxide powders were characterized by x-ray diffraction (XRD), thermogravimetry differential thermal analysis (TG-DTA), particle size analyzer with laser diffraction, inductively coupled plasma (ICP), transmission electron microscopy (TEM), and scanning electron microscopy (SEM). This method provided the oxalate solid solutions containing Ce and R, which were calcined to form the oxide solid solutions at 600 °C in air. The lattice parameter of oxide powders increased linearly with increasing ionic radius of doped rare earth. The size of platelike particles of oxalates and oxides depended on the concentration of oxalic acid and showed a minimum at 0.4 M oxalic acid. Dry milling of oxide powder with α–Al2O3 ball was effective in reducing the size and aspect ratios of particles with little contamination of Al2O3. These rare-earth-doped ceria powders with various sizes were formed by uniaxial pressing (49 MPa) followed by cold isostatic pressing (294 MPa), and sintered at 900–1600 °C in air for 4 h. The micrometer-sized-doped CeO2 powders were densified above 95% of the theoretical density at 1200 °C. The grain size of rare-earth-doped ceria after sintering at 1600 °C was larger in the samples with the larger rare-earth element.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 3 , March 1999 , pp. 957 - 967
Copyright
Copyright © Materials Research Society 1999

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