Interdiffusion in the solid solutions was studied at temperatures ranging from 420 to 560C (table 205). The Boltzmann-Matano method was used to deduce the diffusivities from concentration versus penetration curves which were determined by means of sectioning and X-ray analysis. The interdiffusion coefficient was concentration-dependent and exhibited a bimodal temperature dependence.

Concentration and Temperature-Dependence of the Interdiffusion Coefficient in the NaI-KI Solid Solutions. Y.Haget, N.B.Chanh, P.Garin, L.Bonpunt: Acta Metallurgica, 1975, 23[6], 723-8