Electrochemical Impedance Spectroscopy of Sodium Montmorillonite with Decreasing Water Content

GARCIA, NELSON J.

Atlanta

Congreso; 53rd Annual Meeting of the Clay Minerals Society; 2016

Clay Mineral Society

Electrochemical Impedance Spectroscopy (EIS) is a useful technique for studying solids electrolytes. In that context has also been studied the electrical conductivity of clays such as montmorillonite. In this technique the real and imaginary part of Impedance (Z) are recorded over an interval of frequencies. When the imaginary part (Z") is plotted against the real one (Z´) a Cole-Cole graph is obtained, which is fitted against an equivalent electrical circuit where the resistance of the sample is estimated. The set of experimental steps summarized above are carried out with an impedancemeter controlled with a computer through specific software. In this report measurements carried out on Na-montmorillonite (Lago Pellegrini, Argentine) at relative humidity (RH) lower than 100 are informed.