The O in-diffusion in a liquid phase epitaxial thick film of YBCO on a MgO substrate was investigated by the isothermal electrical resistance relaxation. The results indicated an in-diffusion activation energy of 1.09eV and a chemical diffusion coefficient of 10-10 to 10-9cm2/s at 425 to 500C. In comparison with films prepared by conventional vapor deposition, the liquid phase epitaxial thick film exhibited a larger relaxation characteristic time and thus needs much more time to be fully oxygenated due to the crystal perfection and longer diffusion distance.

Oxygen In-Diffusion in LPE Thick Films of YBCO by Electrical Resistance Relaxation. H.Zhang, X.Yao, X.H.Zeng: Physica Status Solidi A, 2004, 201[10], 2305-11