Abstract
The electrical conductivity of silver alginate complex in the form of circular discs has been investigated as a function of temperature. The Arrhenius plot of ln σ vs 1/ T showed that the conductance gradually increased until it reached a maximum, then it began to decrease with temperature. This parabolic behaviour was interpreted in terms of the decarboxylation of the alginate macromolecules with formation of free radicals and silver metal atoms in the initial stage, followed by dimerization of these radicals in the final stage. The X-ray diffraction pattern showed that the silver alginate complex is amorphous in nature. IR absorption spectra displayed the γ aCO − 2 and γ aCO − 2 bands at 1615 cm −1 and 1400 cm −1, respectively. The activation energies have been calculated and a consistent conductance mechanism is suggested.
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