Anomalous Current Rise and Electrochemical Reduction in Fe2 O 3 ‐ TiO2 Ceramics

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Abstract
An anomalous increase of current was found in Fe‐doped titania ceramics subjected to a constant field. It was proposed that the space‐charge responsible for the current rise comes from the electrochemical reduction due to the blockage of ion transfer at cathode. This viewpoint was supported by evidence from the interior p‐n junction, the electrode location‐dependent anomalous current, the thermally stimulated current, the chemical shift of X‐ray photo‐emission spectra (XPS), and the insulating intermediate layer. Because of its large degradation rate as well as the small adsorption current, the Fe‐doped titania ceramics offer an alternate material for the preparation of synaptic devices.

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