Auger electron spectroscopic techniques were used to monitor the diffusion of O away from the surface of (00•1) monocrystals. The results could be described by:

D (cm2/s) = 4.14 x 10-2 exp[-47.4(kcal/mol)/RT]

and reflected the diffusion of O along the c-axis.

B.J.Flinn, C.S.Zhang, P.R.Norton: Physical Review B, 1993, 47[24], 16499