A molecular interpretation of Maxwell-Wagner-Sillars processes

Ruel McKenzie, Walter Zurawsky, Jovan Mijovic

Research output: Contribution to journalArticle

Abstract

Broadband Dielectric Relaxation Spectroscopy was used to molecularly interpret Maxwell-Wagner-Sillars (MWS) relaxation processes, termed a ζ process, in a heterogeneous laminate configuration with different insulators. The ζ process is due to associated non-covalently bound dipoles that assist in charge migration where the role of the insulator is to allow subsequent discharge away from the material of interest in order for relaxation to occur. The temperature dependent dynamics were characterized in terms of the relaxation time, effective dipole moment and relative molecular associations which were extrapolated from fits of the Havriliak-Negami (HN) equation. The dynamics of the anomalous relaxation process showed a dependence on the properties of the insulator. The ζ process was activated at non phonon timescales. The effective dipole moment of the ζ process phenomenologically had an exponential dependence on temperature and a frictional resistance parameter was introduced. The relative molecular associations through inter and intra cluster interactions depended on characteristics of the insulator and material.

Original languageEnglish (US)
Pages (from-to)11-21
Number of pages11
JournalJournal of Non-Crystalline Solids
Volume406
DOIs
StatePublished - Dec 15 2014

Keywords

  • Dielectric relaxation spectroscopy (DRS)
  • Dynamics
  • Glass formers
  • Grotthuss mechanism
  • Heterogeneous laminate
  • Insulators
  • Maxwell-Wagner-Sillars polarization

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Materials Chemistry

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