Enhanced sinterability of mechanical alloyed La_9.33Si₂Ge₄O₂₆ oxyapatite powders for IT-SOFC electrolytes

详细信息    查看全文

• 作者：R. Serra ; C. Alves ; F.A.C. Oliveira ; T. Marcelo ; J. Mascarenhas ; B. Trindade
• 关键词：A. Sintering ; Lanthanum-based oxyapatite ; Mechanical alloying ; SOFC
• 刊名：Ceramics International
• 出版年：2012
• 出版时间：September, 2012
• 年：2012
• 卷：38
• 期：7
• 页码：5355-5361
• 全文大小：838 K

文摘

Dense oxyapatite-based La_9.33Si₂Ge₄O₂₆ electrolytes have been successfully prepared by electrical sintering at 1400 ¡ãC in static air for 1 h from dry milling La₂O₃, SiO₂ and GeO₂ powders, in adequate atomic proportions, at 350 rpm for 15 h, under controlled environmental conditions, in a planetary ball mill. The densification behaviour of apatite-type phase La_9.33Si₂Ge₄O₂₆ powders synthesized by mechanical alloying was investigated through microstructural evolution with sintering temperature by means of XRD and SEM/EDS analyses. The content of germanium in the sintered samples remained almost constant, suggesting that its incorporation in the apatite phase hinders the high temperature (>1250 ¡ãC) volatilization process.