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|Title:||Phase transition and lattice expansion during hydrogen loading of nanometer sized palladium clusters||Authors:||Suleiman, M.
|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.||URI:||http://hdl.handle.net/20.500.11889/7632||DOI:||10.1016/S0925-8388(02)01286-0|
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