Direct observation of in-plane ordering in the liquid at a liquid Al/α-Al2O3((1)over-bar 1 0 (2)over-bar) interface
Direct observation of in-plane ordering in the liquid at a liquid Al/α-Al2O3((1)over-bar 1 0 (2)over-bar) interface
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DOI：
10.1016/j.actamat.2010.10.069
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发表时间：
2011-02-01
期刊：
影响因子：
9.4
通讯作者：
Kim, Young-Min
中科院分区：
文献类型：
--
作者：
Lee, Sung Bo;Kim, Young-Min
Al/α-Al 2 O 3液/固界面的润湿行为与界面处氧诱导的结构变化密切相关。然而，直接的实验证据可能的界面改性一直很少见。在本研究中，原位高分辨电子显微镜被成功地用于表征在高温下的[0 0 0 1]和[（1）在棒1 0（2）在棒]表面法线方向的液态Al和α-Al 2 O 3之间的界面结构。我们提供的证据，在两个界面的液体（即有序富氧液体界面层）的顺序。在Al/alpha-Al 2 O 3（0 0 0 1）界面处的液体显示出在垂直于界面（分层）的方向上的密度扰动，其周期性接近于alpha-Al 2 O 3的（0 0 0 6）平面的面间距离。另一方面，在Al/α-Al 2 O3（（1）在棒10上（2）在棒上）界面处的液体也显示出具有类似于0.25 nm的层间距的分层，并且另外，具有在前几个液体层内出现的有序度（面内有序），其有序结构类似于Al 2 O而不是α-Al 2 O3。(C)2010 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
Wetting behavior at the Al/alpha-Al2O3 liquid/solid interface is closely correlated with oxygen-induced structural changes at the interface. However, direct experimental evidence for the possible interfacial modifications has been rare. In the present study in situ high-resolution electron microscopy is successfully employed to characterize the structure of the interfaces between liquid Al and alpha-Al2O3 with [0 0 0 1] and [(1) over bar 1 0 (2) over bar] surface normal directions at an elevated temperature. We provide evidence for ordering in the liquid (i.e. ordered oxygen-rich liquid interfacial layers) at both interfaces. The liquid at the Al/alpha-Al2O3(0 0 0 1) interface shows density perturbations in the direction perpendicular to the interface (layering) with a periodicity close to the interplanar distance of the (0 0 0 6) planes of alpha-Al2O3. On the other hand, the liquid at the Al/alpha-Al2O3((1) over bar 1 0 (2) over bar) interface also reveals layering with an interlayer spacing of similar to 0.25 nm and, additionally, with a degree of order occurring within the first few liquid layers (in-plane ordering), the ordered structure of which is similar to Al2O rather than alpha-Al2O3. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.