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Synthesis and electrical conductivity of mullite-type Bi~2~Al~4~O~9~ and (Bi,Ca)~2~Al~4~O~9~ ceramics by Wen-Cheng James Wei; S. Y. Chuang; Y. C. Hu; Hartmut Schneider is a Engineering article available to read on EtoBox.

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## Abstract Mullite-type Bi~2~Al~4~O~9~ is a potential material for electrolytes in solid oxide fuel cells. Colloidal dispersed homogeneous mixtures of commercial, submicron Bi~2~O~3~, Al~2~O~3~ and CaCO~3~ powders were used to fabricate mullite-type Bi~2~Al~4~O~9~ and (Bi,Ca)~2~Al~4~O~9~ by means of reaction sintering in the solid state or in liquid-phase assisted processes. The products were characterized using X-ray diffraction, scanning and transmission electron microscopy, and the sintering density was compared to two conventional sintering runs. This showed that the formation of the mullite-type Bi~2~Al~4~O~9~ proceeds via dissolution of Al~2~O~3~ in Bi~2~O~3~ at the temperatures > 750°C. Details on the formation mechanisms of mullite phase, electrical conductivity versus the residual γ-Bi~24~Al~2~O~39~ phase, and effects of Ca-dopant are reported.

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Author

Wen-Cheng James Wei; S. Y. Chuang; Y. C. Hu; Hartmut Schneider

Publisher

Walter de Gruyter GmbH

Published

2012

Language

EN

Field

Engineering (Physical Sciences)