Abstract
An evolution of the activation energy of Debye's dipolar relaxation of NH4Cl doped ice microcrystals is observed as a function of time. This evolution is characterised by the rotation of the relaxation line (log nu c, 1/T) around a fixed point R in the direction of a decrease in the energy. The temperature corresponding to R is 273+or-4K for all the specimens, but the corresponding relaxation frequency rises with the salt content up to a limiting value corresponding to the crystal saturation.
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