Investigation of chemical and grain boundary effects in highly ordered Sr2FeMoO6: XPS and Mossbauer studies
| Autor(en): | Raekers, M Kuepper, K Hesse, H Balasz, I Deac, IG Constantinescu, S Burzo, E Valeanu, M Neumann, M |
Stichwörter: | double perovskite; DOUBLE-PEROVSKITE; electrical resistivity; ELECTRONIC-STRUCTURE; MAGNETIZATION; magnetoresistance; Materials Science; Materials Science, Multidisciplinary; Mossbauer spectroscopy; Optics; Physics; Physics, Applied; Sr2FeMoO6; STATE; X-ray photoelectron spectroscopy | Erscheinungsdatum: | 2006 | Herausgeber: | NATL INST OPTOELECTRONICS | Journal: | JOURNAL OF OPTOELECTRONICS AND ADVANCED MATERIALS | Volumen: | 8 | Ausgabe: | 2 | Startseite: | 455 | Seitenende: | 460 | Zusammenfassung: | We have studied the oxidation states of Fe and Mo and the presence of grain boundaries in the magneto resistive (MR) compounds Sr2FeMoO6 by means of x-ray photoelectron spectroscopy (XPS), Mossbauer spectroscopy and electrical resistivity measurements. XPS of the Mo 3d and Fe 3s core levels is indicating a mixed valence state involving around 30% Fe3+ - Mo5+ and 70% Fe2+ - Mo6+ states. Mossbauer studies confirm the presence of a valence fluctuation state and an essential amount of grain boundaries in the present Sr2FeMoO6 crystals. Resistivities and magnetoresistance studies evidenced strong grain boundary effects. |
Beschreibung: | 4th International Conference on New Research Trends in Materials Science (ARM-4), Constanta, ROMANIA, SEP 04-06, 2005 |
ISSN: | 14544164 |
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