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.

EMR characterisation of La1.8M0.2CuO4 and La0.9M0.1CoO3 (M = Pr, Sm, Tb) catalysts for methane flameless combustion / C. Oliva, S. Cappelli, A. Kryukov, G.L. Chiarello, A.V. Vishniakov, L. Forni. - In: JOURNAL OF MOLECULAR CATALYSIS. A: CHEMICAL. - ISSN 1381-1169. - 247:1-2(2006), pp. 248-252.

EMR characterisation of La1.8M0.2CuO4 and La0.9M0.1CoO3 (M = Pr, Sm, Tb) catalysts for methane flameless combustion

C. Oliva
Primo
;
S. Cappelli
Secondo
;
G.L. Chiarello;L. Forni
Ultimo
2006

Abstract

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.
partially substituted perovskites ; partially substituted fluorites ; EPR ; ferromagnetic resonance ; magnetic bound polarons ; catalytic methane combustion
Settore CHIM/02 - Chimica Fisica
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/28324
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