Diffusion coefficients and activation energies of Zr nanoparticles in the YBa2Cu3O7-x matrix at 500 to 945C were determined by means of energy dispersive X-ray fluorescence techniques. The results showed that the Zr diffusion coefficient increased markedly with annealing temperature. Two different diffusion coefficients (in grains and over grain boundaries) were determined. The thickness dependences of the Zr diffusion coefficients were described by:

D(cm2/s) =1.47 x 10-4 exp[-1.05(eV)/kT]

and

D(cm2/s) = 2.23 x 10-3 exp[-1.03(eV)/kT]

in grains and over grain boundaries, respectively.

M.Dogruer, O.Gorur, F.Karaboga, G.Yildirim, C.Terzioglu: Powder Technology, 2013, 246, 553-60