Reverse uptake of oxygen from La1-xSrx (Fe3+/Fe4+)O-3 +/-delta perovskite-type mixed oxides (x=0.00, 0.15, 0.30, 0.40, 0.60, 0.70, 0.80, 0.90)
| dc.contributor.author | Leontiou, A. A. | en |
| dc.contributor.author | Ladavos, A. K. | en |
| dc.contributor.author | Bakas, T. V. | en |
| dc.contributor.author | Vaimakis, T. C. | en |
| dc.contributor.author | Pomonis, P. J. | en |
| dc.date.accessioned | 2015-11-24T16:46:28Z | |
| dc.date.available | 2015-11-24T16:46:28Z | |
| dc.identifier.issn | 0926-860X | - |
| dc.identifier.uri | https://olympias.lib.uoi.gr/jspui/handle/123456789/9073 | |
| dc.rights | Default Licence | - |
| dc.subject | la1-xsrx(fe+3/fe+4)o-3 +/-delta | en |
| dc.subject | o-2/tpd | en |
| dc.subject | mossbauer spectroscopy | en |
| dc.subject | no plus co | en |
| dc.subject | methane combustion | en |
| dc.subject | phases | en |
| dc.subject | system | en |
| dc.title | Reverse uptake of oxygen from La1-xSrx (Fe3+/Fe4+)O-3 +/-delta perovskite-type mixed oxides (x=0.00, 0.15, 0.30, 0.40, 0.60, 0.70, 0.80, 0.90) | en |
| heal.abstract | Substituted perovskite-type mixed oxides of the general formula La1-xSrx(Fe3+/Fe4+)O3+/-6 were prepared for x = 0.00, 0.15, 0.30, 0.40, 0.60, 0.70, 0.80, and 0.90 by the ceramic method and heating at 1000degreesC. The prepared solids were examined by X-ray diffractogram (XRD) for their crystal structure and by Mossbauer spectroscopy at RT for the kind and the exact amount of iron containing crystal phases. The gradual substitution of La3+ by Sr2+ results in a quantitative development of the crystal phase SrFe4+O3 and the corresponding diminution of the rest phases containing iron, i.e. LaFeO3 and Fe2O3 (traces). Detailed thermogravimetric O-2/temperature-programmed desorption (TPD) experiments showed that the solids release oxygen when heated in a He atmosphere which is strictly proportional to the amount of Fe4+ in the samples. Quantitative calculations showed that exactly one atom of oxygen is released per unit cell of Sr-Fe-O perovskite, which contains four Sr(Fe4+/Fe3+)O3+/-delta units. The phenomenon is reversible and the solids re-adsorb fast and quantitatively the lost lattice oxygen when gaseous oxygen is admitted back to the system. (C) 2002 Elsevier Science B.V. All rights reserved. | en |
| heal.access | campus | - |
| heal.fullTextAvailability | TRUE | - |
| heal.identifier.secondary | <Go to ISI>://000181260400012 | - |
| heal.identifier.secondary | http://ac.els-cdn.com/S0926860X02004581/1-s2.0-S0926860X02004581-main.pdf?_tid=bac4d915e21de920d92af821d3ca7597&acdnat=1333113715_f7dd4c13572d2e2eea5580ef49a17743 | - |
| heal.journalName | Applied Catalysis a-General | en |
| heal.journalType | peer reviewed | - |
| heal.language | en | - |
| heal.publicationDate | 2003 | - |
| heal.publisher | Elsevier | en |
| heal.recordProvider | Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας | el |
| heal.type | journalArticle | - |
| heal.type.el | Άρθρο Περιοδικού | el |
| heal.type.en | Journal article | en |
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