Abstract
Anchor Practically applicable approach for the fabrication of ABO3 perovskites with high rates of ionic transport is developed. The ionic transport in perovskites with transition metals at B – site is considered in terms of the theory of coordination compounds. It is shown that the structure of these materials is sensitive to the values of the effective charge of the ions of transition metals (Z * ) and to the electronegativity (χ) of the surrounding cations. The magnitudes of Z * and χ can be varied by choosing the appropriate elements at sites A and B to induce a distortion of the short range order. This leads to reduction of potential barriers for formation and migration of structural defects including oxygen vacancies. In typical perovskites a correlation between the rates of the ionic transport and the estimated values of Z * and χ is found.
Highlights
The oxygen incorporation and migration in the perovskite cathode is an important stage of SOFC operation [1,2,3]
We applied the ideas of the theory of coordination compounds (TCC) to develop an approach for fabrication of perovskites with large rates of the ionic transport
It is known that a considerable improvement of the electrochemical performance was observed when Mn in LSM perovskites (LaSrMnO3) was substituted partly or fully for Fe (LSF) [1]
Summary
The oxygen incorporation and migration in the perovskite cathode is an important stage of SOFC (solid oxide fuel cells) operation [1,2,3]. A lot of theoretical works are carried out to find a correlation between the atomic composition and physical properties of perovskites (see, for example, [8, 9]). Last time the descriptor approach [10] is finding ever more wide application to improve the properties of perovskites and other materials.
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