Single crystals with a [123]-type orientation were deformed by using constant strain rates at temperatures of between 540 and 780C. The resultant stress-strain curves were rather similar to those which were observed for Ge, Si and InSb. Two stages of dynamic recovery could be clearly identified. From the strain-rate and temperature dependences of the stress at the beginning of the first recovery stage, an activation energy of 2.3eV was deduced. This was regarded as being a lower bound on the activation energy for self-diffusion of the slowest-moving species. A value of between 0.001 and 0.01cm2/s was estimated for the pre-exponential factor.

H.Siethoff, K.Ahlborn, H.G.Brion, J.Völkl: Philosophical Magazine A, 1988, 57[2], 235-44