Meta-stability and microstructure of the LaFe0.65Co0.3Pd0.05O3 perovskite compound prepared by a modified citrate route
✍ Scribed by G.C. Mondragón Rodríguez; R. Ochrombel; B. Saruhan
- Book ID
- 104022893
- Publisher
- Elsevier Science
- Year
- 2008
- Tongue
- English
- Weight
- 564 KB
- Volume
- 28
- Category
- Article
- ISSN
- 0955-2219
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✦ Synopsis
In this paper we report the synthesis and analysis of lanthanum based perovskites substituted with Pd by employing a modified citrate route. Crystallization and phase sequences of the LaFe 0.65 Co 0.3-x Pd x O 3 (x = 0, 0.05) perovskite(s) are analyzed by means of powder XRD and Rietveld refinement. Regarding the crystal phase development at the LaFe 0.65 Co 0.3 Pd 0.05 O 3 perovskite a meta-stable structure can be postulated at temperatures up to 700 • C. Since no PdO species were detected up to the calcination temperature of 700 • C we can conclude that Palladium ions are successfully incorporated into the B-site of the crystal structure of the perovskite. Reduction of the LaFe 0.65 Co 0.3 Pd 0.05 O 3 perovskite at 600 • C under 5 vol.% H 2 in N 2 which was precalcined at 700 • C causes segregation of palladium to form metallic particles with sizes between 10 and 15 nm. Reversible Pd ions reincorporation into the crystal lattice of the LaFe 0.65 Co 0.3 Pd 0.05 O 3 -700 • C perovskite can be concluded since no PdO was detected after re-oxidation at 600 • C.