Humidity-sensitive electrical conductivity in Ca12 Al14-x Six O32 Cl2+x (0≤x≤3.4) ceramics

Katsuro Hayashi, Hiroki Muramatsu, Satoru Matsuishi, Toshio Kamiya, Hideo Hosono

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11 Citations (Scopus)


The effect of humidity on the electrical conductivity in porous and dense ceramics of Ca12 Al14-x Six O32 Cl2+x (x=0, 1.7, 3.4) with a mayenite structure was examined at room temperature. Surface ionic conductivity was enhanced by increasing the humidity. The sample with x=3.4, which had a porosity of 30%, exhibited the largest conductivity change of about 4 orders of magnitude over the relative humidity range of 10-90% at 25°C. The presence of Cl- ions on the surface most likely enhances the formation of hydronium ions which are responsible for proton transfer in physisorbed water layers.

Original languageEnglish
Pages (from-to)J11-J13
JournalElectrochemical and Solid-State Letters
Issue number2
Publication statusPublished - 2009
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Materials Science(all)
  • Physical and Theoretical Chemistry
  • Electrochemistry
  • Electrical and Electronic Engineering


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