Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Preparation and Sintering Characteristics of Ce0.8Gd0.2O1.9 Powder by Ammonium Carbonate Co-precipitation

탄산암모늄 공침을 이용한 Ce0.8Gd0.2O1.9 분말의 합성 및 소결특성

  • Yoo, Young-Chang (School of Materials Science and Engineering, Hongik University) ;
  • Chung, Byung-Joo (Department of Chemical Engineering, Hongik University) ;
  • Sim, Soo-Man (School of Materials Science and Engineering, Hongik University)
  • 유영창 (홍익대학교 재료공학부) ;
  • 정병주 (홍익대학교 화학공학과) ;
  • 심수만 (홍익대학교 재료공학부)
  • Received : 2011.11.15
  • Accepted : 2012.01.05
  • Published : 2012.01.31
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Abstract

GDC20($Ce_{0.8}Gd_{0.2}O_{1.9}$) powder was synthesized from Ce and Gd nitrate solutions using ammonium carbonate($(NH_4)_2CO_3$) as a precipitant. Attrition-milling of the powder, which had been calcined at $700^{\circ}C$ for 4 h, decreased an average particle size of 2.2 ${\mu}m$ to 0.5 ${\mu}m$. The milled powder consisted of nano-sized spherical primary particles. Due to the excellent sinterability of the powder, sintering of the powder compacts for 4 h showed relative densities of 80% at 1000 $^{\circ}C$ and 96.5% at $1200^{\circ}C$, respectively. Densification was found to almost complete at $1300^{\circ}C$, resulting in a dense and homogeneous microstructure with a relative density of 99.5%. The grains of ~0.2 ${\mu}m$ in size at $1200^{\circ}C$ grew to ~1 ${\mu}m$ in size at $1300^{\circ}C$ as a result of a rapid grain growth.

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  1. Preparation of Ce0.8Gd0.2O1.9 Powder Using CeO2 Powder and Gd Precipitation and Effect of CoO doping on Sintering vol.52, pp.6, 2015, https://doi.org/10.4191/kcers.2015.52.6.521