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 gaseous phase. Iridium is present in the perovskite lattice as Ir4+ replacing iron as is evident from XRD and TEM/EDX results. Compatibility studies carried out at 1000 degrees C demonstrate that iridium has considerable 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.
Original language | English |
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Journal | Solid State Ionics |
Volume | 106 |
Issue number | 1-2 |
Pages (from-to) | 165-172 |
ISSN | 0167-2738 |
DOIs | |
Publication status | Published - 1998 |