Cation self-diffusion studies were carried out in BaO crystals at 900 to 1400C, under oxygen partial pressures of 1atm and 2 x 10-5atm. The 133Ba isotope was used as a tracer for Gruzin's residual activity method. The bulk diffusion coefficient could be represented by:

D(cm2/s) = 1.35 x 104 exp[-4.00(eV/kT]

at 1200 to 1400C, and by

D(cm2/s) = 1.20 exp[-2.81(eV)/kT]

at 950 to 1100C.

S.P.Murarka, R.A.Swalin: Journal of Physics and Chemistry of Solids, 1971, 32[9], 2015-20