Undoped Bi-2223 samples were prepared by using a conventional solid-state reaction method. Doping of Au into Bi-2223 was carried out by means of diffusion from an evaporated Au film on pellets. The Au diffusion in Bi1.8Pb0.35Sr1.9Ca2.1Cu3Oy was studied at 500 to 800C by using the technique of successive removal of thin layers and measurements of lattice parameters deduced from X-ray diffraction patterns at room temperature. The Au diffusion coefficient decreased as the diffusion-annealing temperature was decreased. The temperature dependence of the Au diffusion coefficient at 500 to 800C was described by:

D (cm2/s) = 4.4 x 10-4 exp[-1.08(eV)/kT]

O.Ozturk, T.Küçükömeröglu, C.Terzioglu: Journal of Physics - Condensed Matter, 2007, 19[34] 346205