Complex-impedance spectra of 0.2[(Li2O)1-x-(Na2O)x]-0.8B2O3 mixed-alkali glasses

Shinya Mishina, Junichi Kawamura, Mitsuo Shimoji

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7 Citations (Scopus)


Complex impedance spectra Z{star, open} (ω) of 0.2[(Li2O)1-x-(Na2O)x]-0.8(B2O3) (x=0 to 1) glasses were measured in the frequency range from 5 Hz to 500 kHz. The conductivity relaxation time τM obtained from electric modulus spectra shows remarkable mixed alkali effects as in the case of d.c. conductivity. The use of the usual CPE (constant phase element) in the complex non-linear least square fitting technique was found insufficient to express the observed impedance spectra for mixed-alkali glasses. The present data can be well represented by using the following two-parameter equation: Z{star, open}[ω]= Z[0] [1+(iωτc)n]m (0<n≦, 0<m). For mixed alkali glasses, deviations of parameters m and n from unity are much larger than those in single alkali ones. This suggests that the distribution of relaxation times in considerably enhanced in mixed alkali glasses.

Original languageEnglish
Pages (from-to)323-329
Number of pages7
JournalSolid State Ionics
Issue number4
Publication statusPublished - 1987 May
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics


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