A solid-state electrochemical O concentration cell, with yttria-stabilized zirconia as the electrolyte, was used to study O transport. On one side of the zirconia [a monocrystalline wafer oriented in the (100) plane], reference and counter electrodes were made from sputtered Au. A ceramic pellet of the test oxide was pressed against the other side of the electrolyte. By using this cell, it was possible to drive O electrochemically into (or out of) the test oxide electrode under controlled conditions. Current-time and open-circuit potential recovery data were analyzed in terms of various models. The diffusivity of O in the 94% dense oxide was estimated to be about 5 x 10-8cm2/s at 550C.

E.J.M.O'Sullivan, B.P.Chang: Applied Physics Letters, 1988, 52[17], 1441-3