| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 69287 | Journal of Molecular Catalysis A: Chemical | 2006 | 5 Pages |
A few perovskite-like and fluorite-like samples in which M = Pr, Sm or Tb substitutes for La have been characterised by electron magnetic resonance (EMR) spectroscopy and other techniques. Ferromagnetic (FM) systems form with the fresh biphasic sample with M = Sm only, but not after recalcination, when it becomes monophasic. These systems could be formed of Magnetic Bound Polarons due to the thermally excited J = 1 Sm2+ ions present as impurity in the former case. FM systems form also with the M = Tb sample, but only after catalytic use. In this case FM systems could be composed of Tb4+ ions forming during sample re-oxidation. All these EMR observations have been correlated with the catalytic performance of these samples.
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