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Nano-alloys Synthesized by Controlled Crystallization from Supercooled Atomic Clusters of Elements

Published online by Cambridge University Press:  03 March 2011

X.K. Meng  and
A.H.W. Ngan
X.K. Meng
Affiliation:
National Laboratory of Solid State Microstructures and Department of Materials Science and Engineering, Nanjing University, Nanjing 210093, People’s Republic of China
A.H.W. Ngan*
Affiliation:
Department of Mechanical Engineering, The University of Hong Kong, Hong Kong, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: hwngan@hku.hk
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Abstract

Materials in nanocrystalline forms are well known to possess unusual and interesting properties when compared to the bulk conditions, and these open up an exciting range of novel applications. The key step involved in the systematic exploitation of nanocrystals for real applications lies in the development of reliable methods to synthesize nanocrystals of arbitrary chemical compositions in a range of crystal sizes. In particular, metallic alloy nanocrystals pose a special challenge. We demonstrate that nano-to-micro-sized crystals of intermetallic nickel–aluminide (Ni3Al) ranging from approximately 3 nm to over 100 nm in size can be synthesized by co-sputtering from elemental Ni and Al onto unheated, incompatible organic substrates, followed by controlled postdeposition heat treatment at mild temperatures. The crystal size of approximately 3 nm here is the smallest ever reported for monolithic ordered Ni3Al.

Keywords

SputteringAlloyNanoparticle
Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 3 , March 2004 , pp. 780 - 785
Copyright
Copyright © Materials Research Society 2004

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