The self-diffusion coefficient was determined using radiotracer (72Ga) and serial sectioning techniques at temperatures between 1025 and 1100C. It was concluded that only one undetermined, but simple, diffusion mechanism operated under the conditions used. The diffusion coefficients ranged from 3 x 10-15 to 9 x 10-15cm2/s, under an As partial pressure of 0.75atm., and the results could be described by:

D (cm2/s) = 4 x 10-5 exp[-2.6(eV)/kT]

H.D.Palfrey, M.Brown, A.F.W.Willoughby: Journal of the Electrochemical Society, 1981, 128[10], 2224-8