The diffusivity, at between 200 and 500C, was determined by using a serial sectioning technique (figure 11). A change in the diffusion mechanism occurred at about 400C. This was tentatively attributed to vacancy generation in a basal Cu-O plane.

V.N.Alfeev, P.P.Gorbik, V.V.Dyakin, F.A.Zaitov, V.M.Ogenko, G.M.Shalyapina: Solid State Communications, 1991, 77[1], 49-51

Figure 11

Diffusivity of Ni in Cu3Ba2YO7