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1 Bulletin of the Polish Academy of Sciences. Chemistry

1 2002

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Defect disorder of undoped and Sr-doped LaCoO3-delta

Nowotny J., Rękas M.

Bulletin of the Polish Academy of Sciences. Chemistry

2002

Vol. 50, No. 1

93-108

The paper considers defect disorder models of undoped lanthanum cobaltate, LaCoO(3)-delta, and Sr-doped LaCoO(3-delta, La(1-x)SrCoO(3-delta) (LSC), involving both random defect model and cluster defect model. The models are derived using the nonstoichiometry data reported in the literature. Doubly ionized oxygen vacancies are assumed to be the predominant ionic defects within the entire range of compositions. The effect of Sr content on defect disorder of LSC is discussed in terms of both defect models. Impact of segregationon surface composition of ionic solids in general and LSC materials in particular is briefly outlined. The effect of the interface layer on functional properties of LSC as electrode material is briefly discussed.