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Título

Relaxational dynamics in the glassy, supercooled liquid, and orientationally disordered crystal phases of a polymorphic molecular material

AutorJiménez-Ruiz, M. ; González, M. A.; Bermejo, Francisco Javier ; Miller, M. A.; Birge, N. O.; Cendoya, I.; Alegría, A.
Fecha de publicación1-abr-1999
EditorAmerican Physical Society
CitaciónPhysical Review B 59: 9155- 9166 (1999)
ResumenThe relaxational dynamics of the ambient pressure phases of ethyl alcohol are studied by means of measurements of frequency dependent dielectric susceptibility. A comparison of the a relaxation in the supercooled liquid and in the rotator phase crystal indicates that the molecular rotational degrees of freedom are the dominant contribution to structural relaxation at temperatures near the glass transition, the flow processes having lesser importance. Below the glass transition a secondary β relaxation is resolved for the orientational and structural glasses. Computer molecular-dynamics results suggest that localized molecular librations, strongly coupled to the low-frequency internal molecular motions, are responsible for this secondary relaxation. ©1999 The American Physical Society.
Descripción12 págs.; 12 figs.
Versión del editorhttps://doi.org/10.1103/PhysRevB.59.9155
URIhttp://hdl.handle.net/10261/140555
DOI10.1103/PhysRevB.59.9155
Identificadoresdoi: 10.1103/PhysRevB.59.9155
issn: 0163-1829
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