Bulk self-diffusion coefficients were measured in single crystals by using a methodology which was based upon the use of 57Fe stable isotopes and depth profiling by secondary ion mass spectrometry. The self-diffusion coefficients measured in the c-axis direction, between 900 and 1100C in an oxygen atmosphere, were described by:

D(cm2/s) = 5.2 x 106exp[-510(kJ/mol)/RT]

A.C.S.Sabioni, A.M.J.M.Daniel, W.A.A.Macedo, M.D.Martins, A.M.Huntz, F.Jomard, A.I.C.Persiano: Defect and Diffusion Forum, 2005, 237-240[1], 277-81