The diffusion of Ag in YBa2Cu3O 7 ceramic was studied at 700 to 850C using the energy-dispersive X-ray fluorescence technique. For the excitation of silver atoms, an annular 241Am radioisotope emitting 59.543keV photons was used. The temperature dependences of Ag diffusion coefficients in grains and over the grain boundaries were described by:

D(cm2/s) = 1.4 x 10-2 exp[-1.18(eV)/kT]

and

D(cm2/s) = 3.1 x 10-4 exp[-0.87(eV)/kT]

respectively.

O.Dogan, M.Ertuǧrul, U.Çevik, E.Bacaksiz, E.Tiraşoǧlu, A.I.Kobya, H.Erdoǧan: X-Ray Spectrometry, 2003, 32[5], 363-6