Formation of alumina–ceria mixed oxide in model systems

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• 作者：Tomá ; š ; Ská ; la^a ; ^{tomas.skala@elettra.trieste.it} ; Nataliya Tsud^b ; Kevin C. Prince^a ; Vladim&#xed ; r Matol&#xed ; n^b
• 关键词：Cerium oxide ; Aluminium oxide ; Cerium aluminate ; Thin layer growth ; Photoelectron spectroscopy
• 刊名：Applied Surface Science
• 出版年：2011
• 出版时间：1 February 2011
• 年：2011
• 卷：257
• 期：8
• 页码：3682-3687
• 全文大小：664 K

文摘

Interaction of aluminium with cerium oxide was studied by photoelectron spectroscopy of Al/CeO₂(1 1 1) and CeO₂/Al(1 1 1) model systems. It was found in both cases that metallic aluminium was immediately oxidized, CeO₂ was partially reduced and a mixed oxide with cerium present as Ce³⁺ was formed. The compound is probably cerium aluminate CeAlO₃ mixed with Al₂O₃ or Ce₂O₃. In both cases the intermixing was limited by the diffusion of aluminium into ceria. The excess of deposited material above this limit formed AlO_x and CeO₂ overlayers on the top of the mixed oxide + aluminate/CeO₂ and mixed oxide + aluminate/Al films, respectively.