title: Contributions of dipolar relaxation processes and ionic transport to the response of liquids to electrical perturbation fields.
abstract: The objective of this work was to study the influence of small variations in the chemical structure on the molecular dynamics of liquids using as models bis(cyclohexylmethyl) 2-methyl- and dicyclohexyl 2-methylsuccinate. The dielectric behavior of the low molecular weight liquids was studied over a wide range of frequencies and temperatures. The results show that the temperature dependence of the dielectric strengths, relaxation times, and shape parameters of the secondary and glass-liquid relaxations are very sensitive to the slight differences in the structures of the liquids. Significant changes take place in the dielectric strength of the β relaxation in the glass liquid transition. Moreover, the temperature dependence of the β relaxation exhibits Arrhenius behavior in the glassy state and departs from this behavior in the liquid state. Special attention is paid to the temperature dependence of low-frequency relaxations produced by the motion of a macrodipole arising from charges located near the liquid-electrode boundaries.
authors.affiliation: Instituto Tecnológico de la Energía (ITE), Universitat Politècnica de València, Spain.
authors.forename: M J
authors.initials: MJ
authors.lastname: Sanchis
authors.forename: P
authors.initials: P
authors.lastname: Ortiz-Serna
authors.forename: M
authors.initials: M
authors.lastname: Carsí
authors.forename: R
authors.initials: R
authors.lastname: Díaz-Calleja
authors.forename: E
authors.initials: E
authors.lastname: Riande
authors.forename: L
authors.initials: L
authors.lastname: Gargallo
authors.forename: D
authors.initials: D
authors.lastname: Radić