Influence of alumina impurities on microstructure of LSM–CeO₂ composites

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• 作者：Sanjit Bhowmick ; ^a ; ^{sanjit@engr.uconn.edu} ; Yuan Xue^a ; Jonathan Winterstein^a ; C. Barry Carter^a
• 关键词：Solid-oxide fuel cell ; Impurity segregation ; Impurity phase formation ; Triple phase boundary ; Mn₂AlO₄ ; MnAl₂O₄
• 刊名：Solid State Ionics
• 出版年：2011
• 出版时间：8 April 2011
• 年：2011
• 卷：187
• 期：1
• 页码：68-77
• 全文大小：2403 K

文摘

A two-phase model composite of LSM–CeO₂ was developed to simulate triple phase boundaries of SOFC and to study the impact of alumina impurities on the microstructure. Interfaces between cerium oxide and 10 at. % strontium-doped lanthanum manganite (LSM) were characterized using X-ray diffraction, atomic-force microscopy, focused ion beam milling, field-emission scanning electron microscopy, X-ray energy dispersive spectroscopy and transmission electron microscopy. LSM, which is synthesized by conventional mechanical milling, is found to be doped with alumina from the grinding balls. When LSM powder is mixed with CeO₂ and sintered at 1400 °C for 4 h, manganese aluminate spinel, MnAl₂O₄ and Mn₂AlO₄, forms at LSM/LSM, LSM/CeO₂ and CeO₂/CeO₂ boundaries. The influence of (Mn,Al)₃O₄ phase on the mechanical integrity and performance of the cells is discussed.