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

O’Sullivan, Eugene J. M.; Chang, Bertha P.
April 1988
Applied Physics Letters;4/25/1988, Vol. 52 Issue 17, p1441
Academic Journal
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 [bar_over_tilde:_approx._equal_to]5×10-8 cm2 s-1 at 550 °C.


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