Study of oxygen transport in Ba2YCu3O7−δ using a solid-state electrochemical cell

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Abstract
A solid‐state electrochemical oxygen concentration cell with yttria‐stabilized zirconia (YSZ) as electrolyte was employed to study oxygen transport in Ba2YCu3O7−δ . On one side of the YSZ [a single‐crystal wafer oriented in the (100) plane], reference and counter electrodes were fabricated from sputtered Au. A ceramic pellet of Ba2YCu3O7−δ was pressed against the other side of the electrolyte. Using this cell, it was possible to electrochemically drive oxygen into and out of the Ba2YCu3O7−δ oxide electrode under controlled conditions. Current versus time and open circuit potential recovery data were analyzed according to various models. The diffusivity of oxygen in 94% dense Ba2YCu3O7−δ was estimated to ≂5×10−8 cm2 s−1 at 550 °C.