The Korean Journal of Ceramics

한국세라믹학회 (The Korean Ceramic Society)
권호 표지

Preparation of Proton-Conducting Gd-Doped Barium Cerate by Oxalate Coprecipitation Method

  • Yong Sung Choi (School of Materials Science & Engineering, Hong-Ik University) ;
  • Soo Man Sim (School of Materials Science & Engineering, Hong-Ik University)
  • 발행 : 1998.09.01
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초록

$BaCe_{0.9}Gd_{0.1_O_{2.95}$ powder was synthesized by oxalate coprecipitation method. Precipitate with a stoichimetric ratio of the cations was prepared by adding a mixture of Ba, Ce and Gd nitrate solution to an oxalic acid solution at pH 4. Reaction between the constituent oxides to form a perovskite phase was initiated at $800^{\circ}C$ and a single phase $BaCe_{0.9}Gd_{0.1_O_{2.95}$ powder having good sinterability was obtained after calcination at $1000^{\circ}C$. Sintering green compacts of this powder for 6 h showed a considerable densification to start at $1100^{\circ}C$ and resulted in 93% and 97% relative densities at $1300^{\circ}$ and at $1450^{\circ}C$, respectively. Whereas the power compacts prepared by solid state reaction had lower relative densities, 78% at $1300^{\circ}$and 90% at $1450^{\circ}C$. Fine particles of $CeO_2$ second phase were observed in the surface of the sintered compacts. This was attributed to the evaporation of BaO from the surface that had been exposed during thermal etching.

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참고문헌

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