Preparation of doped ceria powder

Book · Sun Dec 31 04:00:00 EST 1995

OSTI ID:242564

Van Herle, J; Horita, T; Kawada, T; Sakai, N; Yokokawa, H; Dokiya, M ^[1]

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1. National Inst. for Materials and Chemicals Research, Tsukuba Science City (Japan). Tsukuba Research Center

The alleged poor sinterability of (doped) ceria was studied for the application as a fuel cell solid electrolyte, and a solution has been proposed. Yttria doped ceria (YDC) powder Ce{sub 0.667}Y{sub 0.333}O{sub 1.833} was prepared by oxalate coprecipitation through addition of a concentrated yttrium-cerium nitrate solution to a dilute aqueous on of a concentrated oxalic acid solution at neutral pH. The precipitate was washed with alcohol and calcined at 700 C. Coprecipitation conditions were critical for the quality of the resulting oxide powder, of which the average particle size was a key parameter. Compacted into pellets, relative densities attained >95% and >98% of theoretical after firing for 4 hours at 1,300 C and 1,500 C respectively. Sample ``embedding`` with YDC powder further improved the final density. Standard conductivity behavior of the samples was observed. The powder could equally be tape cast and sintered to dense films.

• OSTI ID: 242564
• Report Number(s): CONF-950683--; ISBN 1-56677-095-5
• Country of Publication: United States
• Language: English

Related Subjects

30 DIRECT ENERGY CONVERSION
36 MATERIALS SCIENCE
CERIUM NITRATES
CERIUM OXIDES
ELECTRIC CONDUCTIVITY
EXPERIMENTAL DATA
OXALIC ACID
PH VALUE
PHYSICAL PROPERTIES
PRECIPITATION
SINTERING
SOLID ELECTROLYTE FUEL CELLS
SOLID ELECTROLYTES
SYNTHESIS
TEMPERATURE DEPENDENCE
THERMAL ANALYSIS
X-RAY DIFFRACTION
YTTRIUM NITRATES
YTTRIUM OXIDES