Anormalous frequency-dependent conductivity in DC regime and long correlation length among mobile ions of β-alumina

O. Kamishima, J. Kawamura

Research output: Contribution to journalArticlepeer-review

Abstract

Electrical conductivity measurements of single crystals Na, Ag, Rb and Cd β-alumina have been performed in the frequency range 10−2~107 Hz. Na β-alumina and Ag β-alumina are well known as “super”ionic conductor. Rb β-alumina and Cd β-alumina are “ordinary” solid electrolytes. The magnitude of conductivity depends on the kind of mobile ion strongly. One diffusion step of an ion will result in a change of the local potentials by the ion itself and by its neighbours. The motion of the mobile ions has to be regarded as a highly correlated process under many-particle effects. The present systematic investigation between “super”ionic conductor and “ordinary” solid electrolyte provided an experimental evidence of the many-particle effects in the long-range diffusion. The application of fractal concept for a random walk was helpful us to see the physical means of ion dynamics in the superionic conductor.

Original languageEnglish
Article number115884
JournalSolid State Ionics
Volume377
DOIs
Publication statusPublished - 2022 Apr

Keywords

  • Anomalous diffusion
  • Electrical conductivity
  • Fractal
  • Superionic conductor
  • β-Alumina

ASJC Scopus subject areas

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

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