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In situ transmission electron microscopy of nano-sized metal clusters

Published online by Cambridge University Press:  01 February 2011

Jeff Th. M. De Hosson ,
George Palasantzas ,
Tomas Vystavel  and
Siete Koch
Jeff Th. M. De Hosson
Affiliation:
Dept. of Applied Physics, Materials Science Centre and the Netherlands Institute for Metals Research, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands.
George Palasantzas
Affiliation:
Dept. of Applied Physics, Materials Science Centre and the Netherlands Institute for Metals Research, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands.
Tomas Vystavel
Affiliation:
Dept. of Applied Physics, Materials Science Centre and the Netherlands Institute for Metals Research, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands.
Siete Koch
Affiliation:
Dept. of Applied Physics, Materials Science Centre and the Netherlands Institute for Metals Research, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands.
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Abstract

The paper concentrates on in situ transmission electron microscopy of nano-sized Mo and Nb clusters. In particular, this contribution presents challenges to control the microstructure in nano-structured materials via a relatively new approach, i.e. using a so-called nanocluster source. An important aspect is that the cluster size distribution is monodisperse and that the kinetic energy of the clusters during deposition can be varied. The deposited Mo clusters with sizes 5 nm or larger show a body-centered crystal (bcc) structure. The cubic clusters are self-assembled from smaller ones and forming distorted cubes of typical size 7.8 nm or larger. With reducing cluster size to ≤3 nm, the face centered crystal (fcc) structure appears due to dominance of surface energy minimization, while self-assembly into large cubes with sizes up to 20 nm is still observed. In situ TEM annealing leads to cluster coalescence at temperatures ∼800 °C, with the crystal habit changing to rhombic dodecahedron for isolated clusters, while large cubes change to faceted polyhedra. In situ TEM annealing studies on Nb clusters showed that cluster coalescence events were not observed even at rather elevated temperatures because of the formation of oxides.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 839: Symposium P – Electron Microscopy of Molecular and Atom-Scale Mechanical Behavior, Chemistry, and Structure , 2004 , P7.4
Copyright
Copyright © Materials Research Society 2004

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