The diffusivity was measured by means of tracer serial-sectioning techniques. From the results (table 188), the Ag diffusion activation energies were deduced to be 0.11 and 0.20eV for the α- and β-type phases respectively. These were essentially the same values as those for conduction. The use of the tracers, 105Ag and 110mAg, revealed the existence of an isotope effect (table 189). The appearance of a second-order phase transition at 208K had a negligible effect upon the importance of this phenomenon. It was suggested that the operation of a highly cooperative transport mechanism was responsible for the unusually high observed values of conductivity and diffusivity.

Silver Diffusion and Isotope Effect in Silver Rubidium Iodide. J.S.Arzigian, D.Lazarus: Physical Review B, 1981, 23[2], 640-9

Table 189

Isotope Effect (110mAg/105Ag) for

Ag Diffusion in Ag4RbI5