The microenvironment of iron in (Ba,Ca)(Fe,Co)O3-delta catalyst system: A Mossbauer study

Authors
Homonnay, Z Nomura, K Juhasz, G Vertes, A Ujihira, Y
Citation
Z. Homonnay et al., The microenvironment of iron in (Ba,Ca)(Fe,Co)O3-delta catalyst system: A Mossbauer study, J RAD NUCL, 239(2), 1999, pp. 291-296
Citations number
8
Categorie Soggetti
Inorganic & Nuclear Chemistry
Journal title
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
ISSN journal
02365731 → ACNP
Volume
239
Issue
2
Year of publication
1999
Pages
291 - 296
Database
ISI
SICI code
0236-5731(199902)239:2<291:TMOII(>2.0.ZU;2-O
Abstract
Perovskite type oxides of BaxCa1-xFe0.8Co0.2O3-delta with x = 0.95, 0.8, 0. 6 and 0.4 have been studied by Fe-57 transmission Mossbauer spectroscopy. T he microenvironment of Fe was found to be sensitively dependent on the Ba t o Ca ratio and, more importantly, on the oxygen content. At high Ba concent ration, magnetic relaxation is indicated by the Mossbauer spectra. identifi cation of the various sextets and doublets in the Mossbauer spectra is atte mpted by the help of thermal treatments of the samples in air and methane a s well as by quenching experiments and low temperature measurements.