The Fe diffusion in YBa2Cu3O7 ceramic was studied at 615 to 880C using energy dispersive X-ray fluorescence techniques. The temperature dependences of Fe diffusion in grains and over grain boundaries were described by:

D(cm2/s) = 1.5 x 10-4 exp[-1.25(eV)/kT]

and

D(cm2/s) = 1.8 x 10-5 exp[-0.90(eV)/kT]

respectively.

T.D.Dzhafarov, M.Altunbaş, A.Varilci, U.Çevik, A.I.Kopya: Materials Letters, 1996, 26[6], 305-11