The self-diffusion of 204Tl in single crystals of the solid solutions at 400C was determined by using the serial sectioning technique (figure 10).

A New Method for Determination of Self-Diffusion Coefficients in Solid Solutions. S.Kurihara, K.Fueki, T.Mukaibo: Bulletin of the Chemical Society of Japan, 1974, 47[3], 600-3

Figure 10

Diffusion of Tl in the TlBr-TlCl System