ROMANINI, M.; NÉGRIER, Philippe; TAMARIT, Jose Luis; CAPACCIOLI, Simone; BARRIO, María; PARDO, Luis C.; MONDIEIG, Denise

doi:10.1103/PhysRevB.85.134201

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ROMANINI, M.
Departament de Fisica i Enginyeria Nuclear [UPC, Barcelone] [ETSEIB]

NÉGRIER, Philippe
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

TAMARIT, Jose Luis
Departament de Fisica i Enginyeria Nuclear [UPC, Barcelone] [ETSEIB]

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Physical Review B: Condensed Matter and Materials Physics (1998-2015). 2012, vol. 85, n° 13, p. 134201

American Physical Society

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The dynamics of a simple rigid pseudoglobular molecule (2-adamantanone) has been studied by means of dielectric spectroscopy and examined under the constraints imposed by the space group of the crystal structure determined by x-ray powder diffraction. The low-temperature monoclinic structure of 2-adamantanone, with one molecule per asymmetric unit (Z′=1), displays a statistical intrinsic disorder, concerning the site occupancy of the oxygen atom along three different sites. Such a physically identifiable disorder gives rise to large-angle molecular rotations which inherently lead to time-average fluctuations of the molecular dipole, thus contributing to the dielectric susceptibility. The dielectric spectra for the low-temperature "ordered" phase displays a universal feature of glassy-like materials, i.e., coexistence of α- and β-relaxation processes. The former is clearly identified with the strongly restricted reorientational motions within the long-range "ordered" crystalline lattice. The latter, never observed before in fully translationally and highly orientationally ordered phases, displays all the properties of an original Johari-Goldstein β-relaxation, in spite of the strong character of this glass-like phase. These findings can be explained according to the coupling model, applied to such "ordered" phases.< Réduire

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Emergence of glassy-like dynamics in an orientationally ordered phase

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