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Cation and Water Content Effects on Dipole Rotation Activation Energy of Smectites

USDA-ARS, National Soil Tilth Lab., 2150 Pammel Dr., Ames, IA 50011

View larger version (22K): [in a new window]   Fig. 1. Example of the (a) real and (b) imaginary components of the electrical conductivity spectra for Mg-IMV at 85% relative humidity (water content 0.347 m3 m–3), showing the frequency-dependence.

View larger version (29K): [in a new window]   Fig. 2. Example of landscape activation energy as a function of frequency and (a) decreasing or (b) increasing temperature for Mg-IMV at 85% relative humidity (water content 0.347 m3 m–3).

View larger version (28K): [in a new window]   Fig. 3. Example landscape activation energy as a function of frequency and decreasing temperature for (a) a sample showing a decrease with frequency at lower frequencies, and for (b) a sample showing in increase with frequencies at lower frequencies.

View larger version (25K): [in a new window]   Fig. 4. Activation energies as a function of water content.

View larger version (23K): [in a new window]   Fig. 5. Comparison of activation energy determined from the slope-change frequency with the landscape activation energy.