文档介绍：
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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(Natural Science Research Center, Academy of Fundamental and Interdisciplinary Sciences,
Harbin Institute of Technology, Harbin 150080)
Abstract: 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 % to % at about 1480 ℃, with the maximum shrinkage rate increasing from -
-1 to - -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
×10-3 S·cm-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
0 Introduction
Y2O3 doped BaZrO3 (BZY) are an important class of proton conductors due to their high
protonic conductivity[1] and high chemical stability in SOFC