Diffusion in the molten system was studied by using a 2-chamber diaphragm cell that was separated by a porous sintered glass disk. The apparatus was operated with the membrane in a vertical plane. The cell was calibrated by using various aqueous solutions of KCl, for which the diffusion coefficients were well known. The bromide-filled cell was placed in a furnace that was maintained at 400C for many hours. Only dilute mixtures of the bromides were used, and the diffusion coefficient was found to be 1.71 x 10-5cm2/s.

Measurement of Diffusion Coefficient using a Diaphragm Cell: PbBr2-AgBr System. N.B.Singh, M.E.Glicksman, S.R.Coriell, W.M.B.Duval, G.J.Santoro, R.DeWitt: Journal of Crystal Growth, 1996, 167, 107-10

Figure 7

Diffusion of Pb in Crystals of Pure PbBr2