Electrochemistry of Crystalline Mixed Conductors: Concepts and Examples with SrTiO3

J. Jamnik

Abstract
The electrochemistry of mixed conductors is outlined. In particular the impact of grain boundaries on the transport perpendicular to the grain boundary plane is studied. Fe-doped SrTiO3 bicrystals were used as prototype mixed conductor. Experimental results obtained by optical spectroscopy (chemical diffusion) and electrochemical impedance spectroscopy (electrical transport) are analysed in terms of continuum models. A unified approach based on the use of “chemical capacitors” is briefly explained. For the description of grain boundary, the Schottky model acting on electronic and ionic charge carriers is used.

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Keywords
Mixed conductors, grain boundaries, impedance spectroscopy, chemical diffusion