Data which had been obtained from steady-state creep and tracer diffusion tests were presented. The compound exhibited O non-stoichiometry, and had an orthorhombic layered perovskite structure in which Cu occupied the B sites and the other cations occupied the A sites. The A-site cations diffused more slowly. It was found that, for every species that was considered, diffusion was much faster in the ab-plane than in the c-axis direction. At low stresses, the material deformed by diffusional creep, and the rate-controlling species was the A-site cation.

A.Domínguez-Rodríguez, M.Jiménez-Melendo, N.Chen, K.C.Goretta, S.J.Rothman, J.L.Routbort: Journal de Physique III, 1994, 4[2], 253-60