Conductivity in Na +- and Li +-montmorillonite as a function of equilibration humidity

A considerable influence of relative humidity on the conductivity of sodium and lithium-montmorillonite was found. At high humidity the conductivity values are similar for both type of samples and higher than those measured at low humidity, whereas the activation energies show the opposite relations...

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Bibliographic Details
Published in:Solid state ionics 1996-11, Vol.92 (1), p.139-143
Main Authors: GARCIA, N. J, BAZAN, J. C
Format: Article
Language:English
Subjects:
Crystalline rocks
Earth sciences
Earth, ocean, space
Electrical conductivity
Exact sciences and technology
Experimental petrology
Mineralogy
Montmorillonite
Protonic conduction
Relative humidity
Silicates
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Summary:A considerable influence of relative humidity on the conductivity of sodium and lithium-montmorillonite was found. At high humidity the conductivity values are similar for both type of samples and higher than those measured at low humidity, whereas the activation energies show the opposite relationship. In the low humidity zone the lithium-containing samples exhibit higher conductivity than that of the sodium ones. An explanation is given based on the different nature of the sorbed water and on the hydration power of the Li + and Na + ions.
ISSN:0167-2738
1872-7689
DOI:10.1016/S0167-2738(96)00447-X