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Free keywords:
mixed conductors; grain boundaries; impedance spectroscopy; chemical diffusion
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.
