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Title: Phase transition and lattice expansion during hydrogen loading of nanometer sized palladium clusters
Authors: Suleiman, M. 
Jisrawi, N.M. 
Dankert, O. 
Reetz, M.T. 
Bähtz, C. 
Kirchheim, R. 
Pundt, A. 
Keywords: Clusters;Metal crystals;Metals;Hydrogen - Storage - Materials;Crystallography;Crystal structure and symmetry;Synchrotron radiation
Issue Date: 2003
Publisher: Journal of Alloys and Compounds
Abstract: In situ X-ray diffraction (XRD) measurements for Pd-clusters (3.8 and 6.0 nm) are performed during hydrogen loading and unloading. The lattice parameter increases as a function of the hydrogen partial pressure. The expansion is smaller than that of bulk palladium and is shown to be cluster-size dependent. An (a–a9) phase transition was observed for the large clusters but small clusters do not show this transition. XRD analysis of the as-prepared clusters show that the 3.8-nm sized clusters predominantly have an icosahedral structure, while the 6.0-nm sized clusters have a cubic structure. The effect of size and structure of the cluster on the lattice expansion and on the phase transition will be discussed.
DOI: 10.1016/S0925-8388(02)01286-0
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