The kinetics of O in- and out-diffusion in the crushed YBa2Cu3O7−δ single-crystal prepared by the top-seeded solution-growth (TSSG) were studied by thermogravimetry. By fitting these experimental curves, the chemical in-diffusion coefficient at 375 to 475C were determined as being of the order of 10−10cm2/s for the samples with O deficiencies δ < 0.1. The activation energy in the same samples was also determined as 1.04eV. The out-diffusion exhibited similar kinetics behavior as in the in-diffusion process at a fixed O partial pressure.

Chemical Diffusion of Oxygen in Crushed Single-Crystal YBa2Cu3O7-δ Investigated by Thermogravimetry. Y.Zhang, X.Yao, H.Zhang, Y.Jin: Physica C, 2004, 415[4], 203-8