Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1525551 | Materials Chemistry and Physics | 2009 | 6 Pages |
Abstract
In this study we have focused our attention on the transformations of iron nanowires (Nws) encapsulated in the alumina template pores with the diameter Ãpore from 8 to 30 nm when the samples are stored and annealed in air at temperatures up to 600 °C. Using Mössbauer, XRD and SEM methods we have shown that annealing in air of Fe0Nw arrays in a sealed alumina matrix results in the formation of paramagnetic Fe(II) and Fe(III) compounds, most probably, in a spinel FeAl2O4 (hercynite) and (FexAl1âx)2O3. The diameter of Fe0Nws defined the annealing temperature Tann, at which the ferromagnetic component disappeared, as well as an outcome of transformations. A decrease in the diameter Ãpore results in the disappearance of ferromagnetic iron at lower Tann and in a prevailing formation of a (FexAl1âx)2O3 component. The obtained results were used to clear up a mechanism of these transformations.
Related Topics
Physical Sciences and Engineering
Materials Science
Electronic, Optical and Magnetic Materials
Authors
ArÅ«nas Jagminas, KÄstutis Mažeika, Jonas Reklaitis, Vidas PakÅ¡tas, Dalis BaltrÅ«nas,