Metallic versus covalent bonding: Ga nanoparticles as a case study (Articolo in rivista)

Type
Label
  • Metallic versus covalent bonding: Ga nanoparticles as a case study (Articolo in rivista) (literal)
Anno
  • 2007-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1021/ja0706100 (literal)
Alternative label
  • Ghigna P; Spinolo G; Parravicini G.B; Stella A; Migliori A; Kofman (2007)
    Metallic versus covalent bonding: Ga nanoparticles as a case study
    in Journal of the American Chemical Society (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Ghigna P; Spinolo G; Parravicini G.B; Stella A; Migliori A; Kofman (literal)
Pagina inizio
  • 8026 (literal)
Pagina fine
  • 8033 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • http://pubs.acs.org/doi/abs/10.1021/ja0706100 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 129 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Univ Pisa, Dipartimento Chim Fis, CNR, INSTM IENI, I-27100 Pavia, Italy; Univ Pavia, Dipartimento Chim Fis, CNISM, I-27100 Pavia, Italy; CNR-IMM, I-40129 Bologna, Italy; Univ Nice, CNR, UMR 6622, LPMC, F-06108 Nice, France; IUSS, I-27100 Pavia, Italy (literal)
Titolo
  • Metallic versus covalent bonding: Ga nanoparticles as a case study (literal)
Abstract
  • A systematic X-ray absorption spectroscopy investigation of the local coordination in gallium nanostructures has been performed as a function of temperature and particle size. It is shown that the nanostructure strongly affects the polymorphism of solid gallium and the (meta)stability range of the liquid phase (in agreement with previous works) and that the surface tension acts in the same direction as hydrostatic pressure in stabilizing the Ga solid phases. The effect of surface free energy is first to favor the metallic arrangement of the delta phase and then to stabilize a liquid-like phase based on dimeric molecules even at 90 K. The Ga-Ga distance in the dimers is lower in the liquid phase than in the alpha solid. The experimental results are discussed in comparison with molecular dynamic calculations to assess the presence of covalent character of the dimeric Ga-2 units in liquid nanostructured gallium. (literal)
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