By using p-n junction-depth and electrical conductivity measurements, a study was made of diffusion in single crystals. At 1250C, the diffusivity was equal to 3.3 x 10-12cm2/s and, at 1100 to 1250C, the results could be described by:

D (cm2/s) = 4.5 x 100 exp[-3.70(eV)/kT]

I.Spitsyn, V.S.Arakelyan, A.G.Reznikov, L.N.Menshutin: Doklady Akademii Nauk SSSR, 1972, 205[1], 82-5