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UPCommons - E-prints UPC Universitat Politècnica de Catalunya
Descripción: 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.
Autor(es): Romanini, Michela - Negrier, Philippe - Tamarit Mur, José Luis - Capaccioli, Simon - Barrio Casado, María del - Pardo Soto, Luis Carlos - Mondieig, Denise -
Id.: 55226407
Idioma:
inglés
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Versión: 1.0
Estado: Final
Tipo: 0 p. -
Palabras clave: Àrees temàtiques de la UPC - Enginyeria dels materials -
Tipo de recurso:
Article
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Tipo de Interactividad: Expositivo
Nivel de Interactividad: muy bajo
Audiencia:
Estudiante
- Profesor
- Autor
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Estructura: Atomic
Coste: no
Copyright: sí
: Open Access
Formatos: 0 p. -
Requerimientos técnicos: Browser: Any -
Relación:
[References] http://link.aps.org/doi/10.1103/PhysRevB.85.134201
Fecha de contribución: 05-may-2013
Contacto:
Localización:
* Romanini, M. [et al.]. Emergence of glassy-like dynamics in an orientationally ordered phase. "Physical review B: condensed matter and materials physics", 04 Abril 2012, vol. 85, núm. 13, p. 134201-1-134201-7.
* 1098-0121
* 10.1103/PhysRevB.85.134201
