Defect disorder of undoped and Sr-doped LaCoO_3-delta

• Autorzy: Nowotny J. , Rękas M.
• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

lanthanum cobaltate; perovskites; defect chemistry; nonstoichiometry

PL

lantan; perowskit; defekt chemiczny; związki niestechiometryczne

• Wydawca: Centrum Upowszechniania Nauki PAN
• Czasopismo: Bulletin of the Polish Academy of Sciences. Chemistry
• Rocznik: 2002
• Tom: Vol. 50, No. 1
• Strony: 93--108
• Opis fizyczny: Bibliogr. 27 poz.

Twórcy

autor

Nowotny J.

autor

Rękas M.

• Centre for Materials Research in Energy Conversion, School of Materials Science and Engineering, The University of New South Wales, Sydney, NSW 2052, Australia,