Influence of A- and B-site doping on the properties of the system La2CoO4±δ

In the present paper the compounds LaSrCo0.5M0.5O4±δ (M = Co, Fe, Mn, Ni) and La1.4Sr0.6Co0.5M0.5O4±δ (M = Co, Ni) were prepared and characterised in order to elucidate the influence of strontium doping on A-site as well as doping with transition metals on B-site of the mixed conductor La2CoO4±δ. All the prepared oxides of this paper possessed the K2NiF4 structure, exhibited high electrical conductivity (>100 S/cm) and adequately low linear thermal expansion coefficient. Therefore, they are very promising materials for high temperature electrochemical applications.