Competing redox reactions in Fe-containing AlO(OH) and Al₂O ₃ matrices

A combined investigation by Mössbauer, ESR spectroscopy and thermal analysis

verfasst von

R. Stößer, M. Menzel, M. Feist, M. Nofz, F. Renz

Abstract

The investigation of iron-doped AlO(OH)/Al₂O₃ systems revealed that the combined employment of Mössbauer and ESR spectroscopies together with thermal analysis yields meaningful data with complementary information. This mutual complementarity is based on the coexistence of Fe point defects with the corresponding aggregated FeO_x species which has been observed even for very low Fe concentrations. Competing redox processes between the dopant, the AlO_x matrix, and the gas atmosphere during the thermal treatment enable the generation of solid phases exhibiting specific chemical properties. The entire reaction process is influenced by a specific mechanical and thermal pre-treatment that affects predominantly oxydative processes in the matrix. A protecting influence of the matrix preventing further reductive attack of the Fe³⁺ Fe²⁺ ions by hydrogen has been established.

Organisationseinheit(en)

Institut für Anorganische Chemie

Externe Organisation(en)

Humboldt-Universität zu Berlin (HU Berlin)
Bundesanstalt für Materialforschung und -prüfung (BAM)

Typ

Konferenzaufsatz in Fachzeitschrift

Journal

Journal of Physics: Conference Series

Band

217

ISSN

1742-6588

Publikationsdatum

2010

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Allgemeine Physik und Astronomie

Elektronische Version(en)

https://doi.org/10.1088/1742-6596/217/1/012028 (Zugang: Offen)