Relaxation dynamics and ionic conductivity in a fragile plastic crystal

Abstract

We report a thorough characterization of the dielectric relaxation behavior and the ionic conductivity in the plastic-crystalline mixture of 60% succinonitrile and 40% glutaronitrile. The plastic phase can be easily supercooled and the relaxational behavior is investigated by broadband dielectric spectroscopy in the liquid, plastic crystalline, and glassy crystal phases. The very pronounced alpha-relaxation found in the spectra is characterized in detail. From the temperature dependence of the alpha-relaxation time, a fragility parameter of 62 was determined making this material one of the most fragile plastic-crystalline glass formers. A well-pronounced secondary and faint indications for a third relaxation process were found, the latter most likely being of Johari-Goldstein type. In addition, relatively strong conductivity contributions were detected in the spectra exhibiting the typical features of ionic charge transport.

8 pages, 7 figures

References in corpus (3)

• Temperature development of glassy alpha-relaxation dynamics determined by broadband dielectric spectroscopy
• Broadband dielectric spectroscopy on benzophenone: alpha relaxation, beta relaxation, and mode coupling theory
• $\alpha$- and $\beta$- Relaxation Dynamics of a fragile plastic crystal

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• Thermodynamic and kinetic fragility of Freon113: the most fragile plastic crystal
• Nonlinear dielectric spectroscopy in a fragile plastic crystal
• Supercooled-liquid and plastic-crystalline state in succinonitrile-glutaronitrile mixtures
• Universal correlations between the fragility and interparticle repulsion of glass-forming liquids
• Investigation of nonlinear effects in glassy matter using dielectric methods
• Plastic-crystalline solid-state electrolytes: Ionic conductivity and orientational dynamics in nitrile mixtures
• Low temperature dielectric relaxation study of aqueous solutions of diethylsulfoxide
• Ionic conductivity and relaxation dynamics in plastic-crystals with nearly globular molecules
• Variation of ionic conductivity in a plastic-crystalline mixture