Original scientific paper
Electrochemistry of Crystalline Mixed Conductors: Concepts and Exampleswith 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.
Keywords
Mixed conductors; grain boundaries; impedance spectroscopy; chemical diffusion
Hrčak ID:
10560
URI
Publication date:
29.3.2007.
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