Zieschang, Anne-Marie ; Bocarsly, Joshua D. ; Dürrschnabel, Michael ; Molina-Luna, Leopoldo ; Kleebe, Hans-Joachim ; Seshadri, Ram ; Albert, Barbara (2017)
Nanoscale Iron Nitride, ε-Fe3N: Preparation from liquid ammonia and magnetic Properties.
In: Chemistry of Materials, 29 (2)
doi: 10.1021/acs.chemmater.6b04088
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
ε-Fe3N shows interesting magnetism but is difficult to obtain as a pure and single-phase sample. We report a new preparation method using the reduction of iron(II) bromide with elemental sodium in liquid ammonia at −78 °C, followed by annealing at 573 K. Nanostructured and monophasic oxygen-free iron nitride, ε-Fe3N, is produced according to X-ray diffraction and transmission electron microscopy experiments. The magnetic properties between 2 and 625 K were characterized using a vibrating sample magnetometer, revealing soft ferromagnetic behavior with a low-temperature average moment of 1.5 μB/Fe and a Curie temperature of 500 K. TC is lower than that of bulk ε-Fe3N (575 K) [ Chem. Phys. Lett 2010, 493, 299], which corresponds well with the small particle size within the agglomerates (15.4 (±4.1) nm according to TEM, 15.8(1) according to XRD). Samples were analyzed before and after partial oxidation (Fe3N–FexOy core–shell nanoparticles with a 2–3 nm thick shell) by X-ray diffraction, transmission electron microscopy, electron energy-loss spectroscopy, and magnetic measurements. Both the pristine Fe3N nanoparticles and the oxidized core–shell particles showed shifting and broadening of the magnetic hysteresis loops upon cooling in a magnetic field.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2017 |
| Autor(en): | Zieschang, Anne-Marie ; Bocarsly, Joshua D. ; Dürrschnabel, Michael ; Molina-Luna, Leopoldo ; Kleebe, Hans-Joachim ; Seshadri, Ram ; Albert, Barbara |
| Art des Eintrags: | Bibliographie |
| Titel: | Nanoscale Iron Nitride, ε-Fe3N: Preparation from liquid ammonia and magnetic Properties |
| Sprache: | Englisch |
| Publikationsjahr: | 24 Januar 2017 |
| Verlag: | American Chemical Society |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Chemistry of Materials |
| Jahrgang/Volume einer Zeitschrift: | 29 |
| (Heft-)Nummer: | 2 |
| DOI: | 10.1021/acs.chemmater.6b04088 |
| Kurzbeschreibung (Abstract): | ε-Fe3N shows interesting magnetism but is difficult to obtain as a pure and single-phase sample. We report a new preparation method using the reduction of iron(II) bromide with elemental sodium in liquid ammonia at −78 °C, followed by annealing at 573 K. Nanostructured and monophasic oxygen-free iron nitride, ε-Fe3N, is produced according to X-ray diffraction and transmission electron microscopy experiments. The magnetic properties between 2 and 625 K were characterized using a vibrating sample magnetometer, revealing soft ferromagnetic behavior with a low-temperature average moment of 1.5 μB/Fe and a Curie temperature of 500 K. TC is lower than that of bulk ε-Fe3N (575 K) [ Chem. Phys. Lett 2010, 493, 299], which corresponds well with the small particle size within the agglomerates (15.4 (±4.1) nm according to TEM, 15.8(1) according to XRD). Samples were analyzed before and after partial oxidation (Fe3N–FexOy core–shell nanoparticles with a 2–3 nm thick shell) by X-ray diffraction, transmission electron microscopy, electron energy-loss spectroscopy, and magnetic measurements. Both the pristine Fe3N nanoparticles and the oxidized core–shell particles showed shifting and broadening of the magnetic hysteresis loops upon cooling in a magnetic field. |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Geowissenschaften > Fachgebiet Geomaterialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Elektronenmikroskopie 07 Fachbereich Chemie 07 Fachbereich Chemie > Eduard Zintl-Institut > Fachgebiet Anorganische Chemie |
| Hinterlegungsdatum: | 06 Dez 2018 10:20 |
| Letzte Änderung: | 18 Aug 2021 11:50 |
| PPN: | |
| Sponsoren: | The work at Santa Barbara was supported by the MRSEC Program of the National Science Foundation under award no. DMR 1121053., J.D.B. is supported by the National Science Foundation Graduate Research Fellowship Program under grant no. 1650114., We also acknowledge financial support from the Hessen State Ministry of Higher Education, Research and the Arts via LOEWE RESPONSE., The transmission electron microscopes used in this work were partially funded by the German Research Foundation (DFG/INST163/2951). |
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