Electrochemical cells were used to generate and detect a sinusoidally oscillating wave of the chemical potential of silver propagating through a bisectional sample of pure Ag2S and composite Ag2S(+Al2O3). The chemical diffusion coefficients of Ag in the pure and composite sections were determined, as was the ratio of their thermodynamic factors, by fitting in the frequency regime mathematical relations to the experimentally determined amplitude attenuation and phase shift of the wave. These relations were derived by solving Fick's second law of diffusion under appropriate conditions. The presence of A12O3 particles in the composite material altered its diffusional properties significantly, which was attributed to an adsorption-desorption of Ag ions at the Ag2S-Al2O3 interfaces. The results were correlated with previously reported work.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Renewable Energy, Sustainability and the Environment
- Surfaces, Coatings and Films
- Materials Chemistry