The process of Zn diffusion in YBa2Cu3O7–x ceramics with a porosity of 20–30% was studied from 110 to 450C by using a 65Zn radioactive tracer. The temperature dependence of the tracer diffusion coefficient could be described by:
D (cm2/s) = 5 x 10-9 exp[-0.25(eV)/kT]
It was concluded that Zn migrates predominantly via pores and intergranular layers in the ceramics.
Zinc Diffusion in YBa2Cu3O7–x Ceramics. G.S.Kulikov, R.S.Malkovich, E.A.Skoryatina, V.P.Usacheva: Technical Physics Letters, 2002, 28[5], 427-9
Figure 14
Diffusivity of Sn in Cu3Ba2YO7
Table 81
Diffusion of 65Zn in Polycrystalline Cu3Ba2YO7
Temperature (C) | D (cm2/s) |
798 | 2.7 x 10-12 |
850 | 8.5 x 10-12 |
900 | 3.5 x 10-11 |