Emf measurements were performed on electrolytic cells. Transient and steady-state potentiostatic measurements made it possible to calculate the apparent solubility of I in polycrystalline samples. This, in turn, yielded an estimated diffusion coefficient of 1.1 x 10-5cm2/s.

Solubility and Diffusion of I in Ag4RbI5. R.D.Armstrong, T.Dickinson, H.R.Thirsk, R.J.Whitfield: Journal of Electroanalytical Chemistry and Interfacial Electrochemistry, 1972, 34[1], 47-53