The diffusivity of 35S, 75Se and 125Te was investigated at 600 to 750C by using tracer and serial sectioning techniques. It was found that diffusion involved both fast and slow components. The latter could be described:

D(cm2/s) = 8.3 x 10-6exp[-0.81(eV)/kT]

D(cm2/s) = 1.1 x 10-6exp[-0.76(eV)/kT]

and

D(cm2/s) = 3.4 x 10-7exp[-0.92(eV)/kT]

for S, Se and Te, respectively.

J.N.Simirski, L.P.Firsova: Inorganic Materials, 1984, 20[2], 293-4