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Pressure-induced polyamorphism in TiO2 nanoparticles

Machon, D ; Daniel, M ; Pischedda, V ; Daniele, S ; Bouvier, P ; Lefloch, S Ircelyon, Productionsscientifiques (Editor)

Physical Review B: Condensed Matter and Materials Physics, 2010, Vol.82(140102), pp.1-4 [Peer Reviewed Journal]

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  • Title:
    Pressure-induced polyamorphism in TiO2 nanoparticles
  • Author: Machon, D ; Daniel, M ; Pischedda, V ; Daniele, S ; Bouvier, P ; Lefloch, S
  • Ircelyon, Productionsscientifiques (Editor)
  • Subjects: Chemical Sciences ; Catalysis ; Environmental Sciences ; Environmental and Society ; Environmental Sciences ; Physics
  • Is Part Of: Physical Review B: Condensed Matter and Materials Physics, 2010, Vol.82(140102), pp.1-4
  • Description: Two different nanometric (6 nm) TiO2 compounds, anatase polycrystals and amorphous particles, were investigated under high pressure using Raman spectroscopy. Nanoanatase undergoes a pressure-induced amorphization. The pressure-induced transformations of this mechanically prepared amorphous state are compared with those of a chemically prepared amorphous particles. In the mechanically prepared amorphous state, a reversible transformation from a low-density amorphous state to high-density amorphous state (HDA1) is observed in the range 13-16 GPa. In the chemically prepared sample, a transformation to a new high-density amorphous state (HDA2) is observed at around 21 GPa. Further compression leads to the transformation HDA2 - HDA1 at similar to 30 GPa. We demonstrate that depending on the starting amorphous material, the high-pressure polyamorphic transformations may differ. This observation indicates that pressure is a suited tool to discriminate between nanomaterials apparently...
  • Language: English
  • Identifier: ISSN: 1098-0121 ; E-ISSN: 1550-235X ; DOI: 10.1103/PhysRevB.82.140102

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