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dc.contributor.authorRomanini, Michela
dc.contributor.authorBarrio Casado, María del
dc.contributor.authorCapaccioli, Simon
dc.contributor.authorRuíz Martín, María Dolores
dc.contributor.authorMacovez, Roberto
dc.contributor.authorTamarit Mur, José Luis
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Física
dc.identifier.citationRomanini, M., Del Barrio, M., Capaccioli, S., Ruiz, M., Macovez, R., Tamarit, J. Ll. Double primary relaxation in a highly anisotropic orientational glass-former with low-dimensional disorder. "The journal of physical chemistry. Part C, nanomaterials and interfaces", 26 Abril 2016, vol. 120, núm. 19, p. 10614-10621.
dc.description.abstractThe freezing of the cooperative reorientational motions in orientationally disordered (OD) molecular crystals marks the so-called \glassy" transition, which may be considered a lower-dimensional version of the structural glass transition. While structural glasses display both positional and orientational disorder, in fact, in orientational glasses the disorder involves exclusively the orientational degrees of freedom of the constituent molecules, while the molecular centres of mass form an ordered lattice. We report here on a glass-forming system with even less degrees of freedom, namely the OD phase of a dipolar benzene derivative, pentachloronitrobenzene (C6Cl5NO2). We probe the orientational dynamics of PCNB as a function of temperature and pressure by means of dielectric spectroscopy at normal and high pressure and high-pressure density measurements, and show that the system exhibits a double primary relaxation feature associated with two distinct motions of the molecular dipole moment. After ruling out an interpretation in terms of primitive or intramolecular relaxations, we discuss an assignment of the double relaxation feature based on the material's anisotropy and on the comparison with discotic liquid crystals.
dc.format.extent8 p.
dc.subjectÀrees temàtiques de la UPC::Física
dc.subjectÀrees temàtiques de la UPC::Enginyeria química::Química física
dc.subject.lcshGlass manufacture--Chemistry
dc.subject.otherhexa-substitued benzenes
dc.subject.othergoldstein beta-relaxation
dc.subject.otherdiscotic liquid-crystals
dc.subject.otherplastic crystals
dc.subject.othertransition phenomena
dc.subject.otherdielectric loss
dc.subject.othersupercooled liquids
dc.subject.otherdynamic properties
dc.subject.otheralpha relaxation
dc.titleDouble primary relaxation in a highly anisotropic orientational glass-former with low-dimensional disorder
dc.subject.lemacVidre -- Fabricació -- Química
dc.contributor.groupUniversitat Politècnica de Catalunya. GCM - Grup de Caracterització de Materials
dc.description.peerreviewedPeer Reviewed
dc.rights.accessOpen Access
dc.description.versionPostprint (published version)
local.citation.authorRomanini, M.; Del Barrio, M.; Capaccioli, S.; Ruiz, M.; Macovez, R.; Tamarit, J. Ll.
local.citation.publicationNameThe journal of physical chemistry. Part C, nanomaterials and interfaces

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