Comparison of Lithium Oxide and Bismuth Oxide as Sintering Aids for Barium Y2O3-Doped Barium Zirconate

LE Shiru*; ZHU Xiaodong; SUN Kening

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Comparison of Lithium Oxide and Bismuth Oxide as Sintering Aids for Barium Y2O3-Doped Barium Zirconate

LE Shiru* 1 * #,ZHU Xiaodong 2,SUN Kening 2

1.Natural Science Research Center, Academy of Fundamental and Interdisciplinary Sciences，Harbin Institute of Technology, Harbin 150080

2.Natural Science Research Center, Academy of Fundamental and Interdisciplinary Sciences，Harbin Institute of Technology,Harbin,150080

*Correspondence author

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Funding: National Science Foundation of China（No.No.21006016）, Postdocotoal Science-Research Foundation（No.No.LBH-Q11112）, Specialized Research Fund for the Doctoral Program of Higher Education of China （No.No.20102302120044）

Opened online:16 July 2013

Accepted by: none

Citation: LE Shiru*,ZHU Xiaodong,SUN Kening.Comparison of Lithium Oxide and Bismuth Oxide as Sintering Aids for Barium Y2O3-Doped Barium Zirconate[OL]. [16 July 2013] http://en.paper.edu.cn/en_releasepaper/content/4550873

Decreasing Y2O3-doped barium zirconate (BZY) sintering temperature is crucial for its implementation in solid oxide fuel cells (SOFCs). Bismuth oxide and lithium oxide as sintering aids for BZY were evaluated. It is found that 3 mol% Bi2O3 doped BZY (BZY-3Bi) improves its shrinkage from 10.4 % to 19.02 % at about 1480 ℃, with the maximum shrinkage rate increasing from -0.20 mm.min-1 to -0.34 mm.min-1. No pores could be seen in the BZY-3Bi and BZY-5Bi in the SEM images when the samples were sintered at 1400 ℃ for 24 h . However, both shrinkage tests and SEM images demonstrate that lithium oxide is detrimental for BZY as sintering aid. The conductivity of BZY-2Bi is 1.13 ×10-3 Socm-1 in wet hydrogen atmosphere at 600 ℃ sintered at 1400 ℃ for 24 h, nearly equal to that of BZY-0Bi.

Keywords:Solid Oxide Fuel Cells; Yttria-doped barium zirconate; Bismuth Oxide; Lithium Oxide; Sintering Aids

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