Defect structure and electrical properties of La1-ySryFe1-xAlxO3-delta

Authors
Kuscer, D Hanzel, D Holc, J Hrovat, M Kolar, D
Citation
D. Kuscer et al., Defect structure and electrical properties of La1-ySryFe1-xAlxO3-delta, J AM CERAM, 84(5), 2001, pp. 1148-1154
Citations number
17
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
ISSN journal
00027820 → ACNP
Volume
84
Issue
5
Year of publication
2001
Pages
1148 - 1154
Database
ISI
SICI code
0002-7820(200105)84:5<1148:DSAEPO>2.0.ZU;2-7
Abstract
La1-ySryFe1-xAlxO3-delta perovskites were studied as potential materials fo r solid-oxide fuel cell (SOFC) cathodes. The phase relations in the LaFeO3- SrFeO3-delta-LaAlO3 system were investigated by X-ray powder diffraction an alysis. The defect structure of the La1-ySryFe1-xAlxO3-delta perovskites wa s investigated by Mossbauer spectroscopy and weight-loss analysis. Relation s between the nonstoichiometry and the conductivity of the La1-ySryFe1-xAlx O3-delta perovskites were investigated. The incorporation of aluminum (x) i nto LaFe1-xAlxO3 was found to have no influence on the defect structure but to decrease the conductivity. The incorporation of strontium OI) into La1- ySryFe1-xAlxO3-delta promotes the formation of anion vacancies and Fe4+ tha t lead to higher conductivity.