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Originally published in Science Express on 6 October 2005
Science 28 October 2005:
Vol. 310. no. 5748, pp. 661 - 663
DOI: 10.1126/science.1118611
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Reports

Ordered Liquid Aluminum at the Interface with Sapphire

S. H. Oh,1* Y. Kauffmann,2* C. Scheu,1,3 W. D. Kaplan,2{dagger} M. Rühle1

Understanding the nature of solid-liquid interfaces is important for many processes of technological interest, such as solidification, liquid-phase epitaxial growth, wetting, liquid-phase joining, crystal growth, and lubrication. Recent studies have reported on indirect evidence of density fluctuations at solid-liquid interfaces on the basis of x-ray scattering methods that have been complemented by atomistic simulations. We provide evidence for ordering of liquid atoms adjacent to an interface with a crystal, based on real-time high-temperature observations of alumina-aluminum solid-liquid interfaces at the atomic-length scale. In addition, crystal growth of alumina into liquid aluminum, facilitated by interfacial transport of oxygen from the microscope column, was observed in situ with the use of high-resolution transmission electron microscopy.

1 Max-Planck-Institut für Metallforschung, 70569 Stuttgart, Germany.
2 Department of Materials Engineering, Technion–Israel Institute of Technology, Haifa 32000, Israel.
3 Now Department of Physical Metallurgy and Materials Testing, University of Leoben, A-8700 Leoben, Austria.

* These authors contributed equally to this work.

{dagger} To whom correspondence should be addressed. E-mail: kaplan{at}tx.technion.ac.il

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