Ionic conductivity of montmorillonite/alkali salt mixtures

Tatsuya Kawada, Harumi Yokokawa, Masayuki Dokiya

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14 Citations (Scopus)


The ionic conductivity of montmorillonite (MMT) and MMT/alkali salt mixtures were investigated in the temperature region of RT-400°C by the ac impedance technique. Sodium- or lithium-ion-type MMT showed low conductivity (10-7 to 10-6 S cm-1 at 200°C). The alkali salts (NaSCN, LiI, etc.)/MMT systems showed an enhancement in ionic conductivity similar to the LiI/γ-Al2O3 system. Among the systems investigated, the NaSCN/MMT system showed the highest conductivity (10-4 S cm-1 at 200°C) at the composition where NaSCN occupied completely the Na+ ion sites available in MMT. This characteristic feature is considered to be due to the intercalation ability and/or thin film forming ability of MMT.

Original languageEnglish
Pages (from-to)210-213
Number of pages4
JournalSolid State Ionics
Issue numberPART 1
Publication statusPublished - 1988 Sept


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