The porous-frit technique was used to investigate self-diffusion in molten samples. The data for temperatures ranging from 380 to 540C could be described by:

D (cm2/s) = 7.4 x 10-4 exp[-6.5(kcal/mol)/RT]

Self-Diffusion in Molten Lead Bromide. C.A.Sjöblom, J.Andersson: Zeitschrift für Naturforschung, 1968, 23a[2], 239-41