Gold diffusion in superconducting Bi1.8Pb0.35Sr1.9Ca2.1Cu3Oy was investigated at 500 to 800C by using the energy dispersive X-ray fluorescence technique. The temperature dependences of Au diffusion coefficient in grains and over grain boundaries were described by:

D1 = 6.7 x 10−5exp[−1.19(eV)/kT]

and

D2 = 9.7 x 10−4exp[−1.09(eV)/kT]

respectively. The diffusion doping of Bi-2223 by Au causes a significant increase of the lattice parameter c by about 0.19%.

C.Terzioglu: Physica B, 2008, 403[18], 3320-5