Two methods were used for the determination of tracer diffusion coefficients in molten salts. Both were based upon the diffusion of instantaneously applied infinitely-thin radioactive sources into semi-infinite one-dimensional media. In the one method, the melt was absorbed in sintered porous MgO-strips. In the other method, the melt was maintained as a cylindrical thin layer with a thickness of 0.025 to 0.030cm. The tracer diffusion coefficients which were obtained (table 121) in pure molten NaCl, by using the second method were in excellent agreement with sintered porous strip data.

Tracer Diffusion Coefficients in Molten Salts—I. Methods. K.Grjotheim, T.Naterstad, K.E.Troklep, H.A.Oye: Electrochimica Acta, 1978, 23[5], 451-6

Table 122

Diffusivity of Co2+ Ions in NaCl Melts at 806C