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The European Physical Journal Special Topics

, Volume 167, Issue 1, pp 19–25 | Cite as

Real-time icosahedral to fcc structure transition during CoPt nanoparticles formation

  • J. Penuelas
  • P. AndreazzaEmail author
  • C. Andreazza-Vignolle
  • C. Mottet
  • M. De Santis
  • H. C.N. Tolentino
Regular Article

Abstract

Nucleation and growth of supported CoPt nanoparticles were studied in situ and in real time by combined grazing incidence small-angle x-ray scattering (GISAXS) and grazing incidence x-ray diffraction (GIXD). GISAXS provides morphological features of nanoparticles as a function of size, shape and correlation distance between particles, while GIXD allows the determination of the atomic structure. We focus on the formation of ultrasmall CoPt nanoparticles, in the 1–4 nm size range at 500C. The structural analysis method based on the Debye equation is coupled with cluster model calculations performed by Monte Carlo simulations using a semi-empirical tight-binding potential to interpret diffraction spectra and structural transitions. Our results show that the cluster structure evolution during the growth is size-dependent and composition-dependent, yielding an icosahedral to fcc structure transition.

Keywords

Monte Carlo European Physical Journal Special Topic CoPt European Synchrotron Radiation Facility Debye Equation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© EDP Sciences and Springer 2009

Authors and Affiliations

  • J. Penuelas
    • 1
  • P. Andreazza
    • 1
    Email author
  • C. Andreazza-Vignolle
    • 1
  • C. Mottet
    • 2
  • M. De Santis
    • 3
  • H. C.N. Tolentino
    • 3
  1. 1.Centre de Recherche sur la Matière Divisée, UMR 6619 Université d’Orléans-CNRSOrléans CedexFrance
  2. 2.Centre Interdisciplinaire de Nanosciences de Marseille, CNRSMarseille Cedex 9France
  3. 3.Institut Néel, CNRS & UJFGrenoble Cedex 9France

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