Oxygen Nonstoichiometry and Transport Properties of Selected La1-xSrxCo1-y-zFeyNizO3-delta Perovskites

• Autorzy: Świerczek K.
• Języki publikacji: EN

Abstrakty

EN

Crystal structure, high temperature oxygen nonstoichiometry and transport properties of two members of La1-xSrxCo1-y-zFeyNizO3-delta group of perovskite type oxides are presented. La0.6Sr0.4Co0.2Fe0.6Ni0.2O3-delta and La0.9Sr0.1Co1/3Fe1/3Ni1/3O3-delta compositions po sess high electrical conductivity at high temperatures in air. How ever, the observed characteristics of the electrical conductivity as a function of the oxygen partial pressure for these materials are significantly different. A discussion of the observed effects is provided, which shows strong correlation between chemical composition, crystal structure, oxygen nonstoichiometry and the observed transport properties. An interesting phenomenon related to an irreversible oxygenation of the quenched La0.6Sr0.4Co0.2Fe0.6Ni0.2O3-delta samples was observed. This reaction takes place at 200–300 graduate C range which is well below a typical nonstoichiometry related reactions. A possible explanation of this effect is discussed.

Słowa kluczowe

EN

perovskite oxide; cathode material; solid oxide fuel cell; transport properies

• Wydawca: Polskie Towarzystwo Chemiczne
• Czasopismo: Polish Journal of Chemistry
• Rocznik: 2009
• Tom: Vol. 83, nr 8
• Strony: 1437--1442
• Opis fizyczny: Bibliogr. 9 poz., rys.

Twórcy

autor

Świerczek K.

• Faculty of Materials Science and Ceramics, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Kraków, Poland,

Bibliografia

• 1. Molenda J., Świerczek K. and Zając W., J. Power Sources, 173, 657 (2007).
• 2. Ivers-Tiffee E., Weber A. and Herbstritt D., J. Europ. Ceram. Soc, 21, 1805 (2001).
• 3. Liu Q.L., Khor K.A. and Chan S.H., J. Power Sources, 161, 123 (2006).
• 4. Skinner S.J., Int. J. Inorg. Mat., 3, 113 (2001).
• 5. Zając W, Świerczek K. and Molenda J., J. Power Sources, 173, 675 (2007).
• 6. Świerczek K., Marzec J., Pałubiak D., Zając W. and Molenda J., Solid State Ionics, 177, 1811 (2006).
• 7. Świerczek K., Solid State Ionics, 179, 126 (2008).
• 8. Świerczek K. and Gozu M., J. Power Sources, 173, 695 (2007).
• 9. Marzec J., J. Power Sources, 173, 671 (2007).