Browsing by Author "Rabiller, P"

Now showing 1 - 2 of 2
  • No Thumbnail Available
    Item
    Neutron Laue and X-ray diffraction study of a new crystallographic superspace phase in n-nonadecane-urea
    (International Union of Crystallography, 2015-01) Zerdane, S; Mariette, C; McIntyre, GJ; Lemée-Cailleau, MH; Rabiller, P; Guérin, L; Ameline, JC; Toudic, B
    Aperiodic composite crystals present long-range order without translational symmetry. These materials may be described as the intersection in three dimensions of a crystal which is periodic in a higher-dimensional space. In such materials, symmetry breaking must be described as structural changes within these crystallographic superspaces. The increase in the number of superspace groups with the increase in the dimension of the superspace allows many more structural solutions. This is illustrated in n-nonadecane-urea, revealing a fifth higher-dimensional phase at low temperature. © International Union of Crystallography
  • No Thumbnail Available
    Item
    Temperature-pressure phase diagram of an aperiodic host guest compound
    (Euorpean Physical Society, 2011-01-01) Toudic, B; Rabiller, P; Bourgeois, L; Huard, M; Ecolivet, C; McIntyre, GJ; Bourges, P; Breczewski, T; Janssen, T
    This letter reports on the structural instabilities of an aperiodic composite crystal under pressure. The (P, T) phase diagram up to 0.55GPa of nonadecane-urea is reported showing various symmetry breakings in crystallographic superspaces, towards three different orthorhombic phases. These structural phase transitions are characterized by a change in the intermodulation and are described by increasing the rank of the crystallographic superspaces. © EPLA, 2011