Amorphous silica-like carbon dioxide (Articolo in rivista)

Type
Label
  • Amorphous silica-like carbon dioxide (Articolo in rivista) (literal)
Anno
  • 2006-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1038/nature04879 (literal)
Alternative label
  • Santoro, M; Gorelli, FA; Bini, R; Ruocco, G; Scandolo, S; Crichton, WA (2006)
    Amorphous silica-like carbon dioxide
    in Nature (Lond.)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Santoro, M; Gorelli, FA; Bini, R; Ruocco, G; Scandolo, S; Crichton, WA (literal)
Pagina inizio
  • 857 (literal)
Pagina fine
  • 860 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 441 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Mario Santoro1,2, Federico A. Gorelli1,2, Roberto Bini1,3, Giancarlo Ruocco2,4, Sandro Scandolo5 and Wilson A. Crichton6 1. European Lab Nonlinear Spect, LENS, I-50019 Florence, Italy 2. INFM, I-50019 Florence, Italy 3. Univ Roma La Sapienza, CNR, INFM, CRS,SOFT, I-00185 Rome, Italy 4. Univ Florence, Dipartimento Chim, I-50019 Florence, Italy 5. Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy 6. INFM, Democritos Natl Smithsonian Ctr, I-34014 Trieste, Italy 7. European Synchrotron Res Facil, F-38043 Grenoble, France (literal)
Titolo
  • Amorphous silica-like carbon dioxide (literal)
Abstract
  • Among the group IV elements, only carbon forms stable double bonds with oxygen at ambient conditions. At variance with silica and germania, the non-molecular single-bonded crystalline form of carbon dioxide, phase V, only exists at high pressure(1-9). The amorphous forms of silica (a-SiO2) and germania (a-GeO2) are well known at ambient conditions; however, the amorphous, non-molecular form of CO2 has so far been described only as a result of first-principles simulations(9). Here we report the synthesis of an amorphous, silica-like form of carbon dioxide, a-CO2, which we call 'a-carbonia'. The compression of the molecular phase III of CO2 between 40 and 48 GPa at room temperature initiated the transformation to the non-molecular amorphous phase. Infrared spectra measured at temperatures up to 680 K show the progressive formation of C-O single bonds and the simultaneous disappearance of all molecular signatures. Furthermore, state-of-the-art Raman and synchrotron X-ray diffraction measurements on temperature-quenched samples confirm the amorphous character of the material. Comparison with vibrational and diffraction data for a-SiO2 and a-GeO2, as well as with the structure factor calculated for the a-CO2 sample obtained by first-principles molecular dynamics(9), shows that a-CO2 is structurally homologous to the other group IV dioxide glasses. We therefore conclude that the class of archetypal network-forming disordered systems, including a-SiO2, a-GeO2 and water, must be extended to include a-CO2. (literal)
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