Modeling the ac conductivity dispersion of mixed alkali germanate glasses

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The ac conductivity and permittivity of mixed alkali, (Li2O)x(Na2O)1-x: 9GeO2, glasses are reported. An analysis of the scaling properties is performed which indicates the ac conductivity and permittivity at different temperatures but fixed glass composition can be collapsed to a master curve. However, these master curves exhibit systematic changes with cation mixing which include a decrease in the conductivity dispersion exponent and substantial increase of dielectric loss at low frequencies. A simple model, based upon the dynamic structure model of Ingram and coworkers, is introduced in an attempt to understand these changes. A key feature of the model is the assumption that the cation's local conduction space is modified by mixing of the two cation species.

Original languageEnglish (US)
Pages (from-to)18-29
Number of pages12
JournalJournal of Non-Crystalline Solids
Issue number1-3
StatePublished - Aug 2001
Externally publishedYes

All Science Journal Classification (ASJC) codes

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


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