TITLE

Structural dynamics of gas-phase molybdenum nanoclusters: A transmission electron microscopy study

AUTHOR(S)
Vystavel, T.; Koch, S. A.; Palasantzas, G.; De Hosson, J. Th. M.
PUB. DATE
March 2005
SOURCE
Applied Physics Letters;3/14/2005, Vol. 86 Issue 11, p113113
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
In this paper we study structural aspects of molybdenum clusters by transmission electron microscopy. The deposited clusters with sizes 4 nm or larger show a body-centered crystal (bcc) structure. The clusters are self-assembled from smaller structural units and form cuboids with a typical size of 4 nm or larger. With reducing cluster size, the face-centered crystal (fcc) structure appears due to dominance of surface energy minimization, while self-assembly into large cuboids with sizes up to 30 nm is still observed. Our observation implies that the basic building blocks of large cuboids are actually not smaller cubes. Annealing leads to cluster coalescence at temperatures ∼800 °C, with the crystal habit changing to truncated rhombic dodecahedron for isolated clusters, while the large cuboidally shaped particles become more faceted polyhedra.
ACCESSION #
16581554

 

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