The influence of co-sintering Bi2O3 on Yb0.2Ce0.8O2-δ ceramic SOFC

Influences of Bi0.75Y0.25O1.5 addition on the microstructure and ionic conductivity of Ce0.8Y0.2O1.9 ceramics

“…However, there is still a serious problem after the doped‐Bi 2 O 3 addition into CeO 2 or ZrO 2 ‐based ceramics because of the elemental inter‐diffusion and resultant impure phase formation. Budiana et al 20 found that a non‐conductive phase of Bi 5 Yb 3 O 12 had formed after adding 4 mol% Bi 2 O 3 into Ce 0.8 Yb 0.2 O 2‐δ . In order to retard the elemental diffusion as well as impure phase formation, the same doping element of Y was chosen to stabilize Bi 2 O 3 and dope CeO 2 to synthesize YSB and YDC powders, and then the composite ceramics of YDC‐xYSB (x = 0, 5, 10, 20, 30, 40 wt%) were sintered and prepared in this experiment.…”

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A second phase of Y 2 O 3 -stabilized Bi 2 O 3 (Bi 0.75 Y 0.25 O 1.5 ,YSB) is introduced into Y 2 O 3 -doped CeO 2 (Ce 0.8 Y 0.2 O 1.9 ,YDC) as a sintering additive and the composite ceramics of 5,10,20,30, 40 wt%) are prepared through sintering at 1100°C for 6 h in air atmosphere. The YDC-xYSB ceramics are composed of both YDC and YSB with cubic fluorite structure, and no other impurity phases are detected in XRD patterns.

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