INFLUENCE OF IRIDIUM ON THE REACTIVITY OF LAFEO3 BASE PEROVSKITES

Authors
KINDERMANN L DAS D BAHADUR D NICKEL H
Citation
L. Kindermann et al., INFLUENCE OF IRIDIUM ON THE REACTIVITY OF LAFEO3 BASE PEROVSKITES, Solid state ionics, 106(1-2), 1998, pp. 165-172
Citations number
17
Categorie Soggetti
Physics, Condensed Matter","Chemistry Physical
Journal title
Solid state ionics → ACNP
ISSN journal
01672738
Volume
106
Issue
1-2
Year of publication
1998
Pages
165 - 172
Database
ISI
SICI code
0167-2738(1998)106:1-2<165:IOIOTR>2.0.ZU;2-U
Abstract
The influence of iridium on the reactivity of powder mixtures made of perovskites and 8 mol% yttria stabilized zirconia (8 YSZ) is reported. Iridium is added to the perovskites of the composition (La0.6M0.4)(z) Fe0.8TM0.2O3-delta (M = Sr, Ca; TM = Mn, Co; z = 0.90, 1.00) via the g aseous phase. Iridium is present in the perovskite lattice as Ir4+ rep lacing iron as is evident from XRD and TEM/EDX results. Compatibility studies carried out at 1000 degrees C demonstrate that iridium has con siderable influence on the reactivity. The results are discussed with respect to the stability of the perovskites, thermodynamic activities, Ir(IV)-O bonding, tolerance factor and oxygen migration.