Interpreting the nonlinear dielectric response of glass-formers in terms of the coupling model

The Journal of Chemical Physics
K L Ngai

Abstract

Nonlinear dielectric measurements at high electric fields of glass-forming glycerol and propylene carbonate initially were carried out to elucidate the dynamic heterogeneous nature of the structural α-relaxation. Recently, the measurements were extended to sufficiently high frequencies to investigate the nonlinear dielectric response of faster processes including the so-called excess wing (EW), appearing as a second power law at high frequencies in the loss spectra of many glass formers without a resolved secondary relaxation. While a strong increase of dielectric constant and loss is found in the nonlinear dielectric response of the α-relaxation, there is a lack of significant change in the EW. A surprise to the experimentalists finding it, this difference in the nonlinear dielectric properties between the EW and the α-relaxation is explained in the framework of the coupling model by identifying the EW investigated with the nearly constant loss (NCL) of caged molecules, originating from the anharmonicity of the intermolecular potential. The NCL is terminated at longer times (lower frequencies) by the onset of the primitive relaxation, which is followed sequentially by relaxation processes involving increasing number of molecul...Continue Reading

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Citations

Mar 24, 2016·The Journal of Chemical Physics·M MichlA Loidl
Sep 1, 2015·The Journal of Physical Chemistry. B·K L NgaiLi-Min Wang
Sep 5, 2015·The Journal of Physical Chemistry. B·K L NgaiLi-Min Wang
Jun 20, 2015·The Journal of Physical Chemistry. B·S CapaccioliD Prevosto
May 8, 2016·Biochimica Et Biophysica Acta. General Subjects·K L NgaiA Paciaroni
Jul 1, 2017·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Ranko Richert
Jun 23, 2018·Physical Chemistry Chemical Physics : PCCP·Wioleta Edyta Smiszek-LindertMarian Paluch

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