Simon, D. ; Wuest, H. ; Koehler, T. ; Senyshyn, A. ; Ehrenberg, H. ; Gutfleisch, O. (2019)
The quaternary system Sm-Fe-Mo-Al and the effect of Al substitution on magnetic and structural properties of its ThMn12 phase.
In: Journal of Alloys and Compounds, 770
doi: 10.1016/j.jallcom.2018.08.030
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
The Fe-rich corner of the quaternary system Sm-Fe-Mo-Al is studied at isothermal conditions. The phase equilibria of ferromagnetic with adjacent phases, especially , are observed for 1000 °C. Existence ranges are studied by SEM/EDX on samples with various compositions. Magnetic and structural properties were obtained by VSM(PPMS) as well as Permagraph measurements while structural relations were tracked by XRD. Al can be substituted for Fe up to x = 6.5 accompanied by a decrease in high field (8 MA/m 10 T) polarization from 0.66 T (x = 0.0) to 0.44 T (x = 2.0). Respective Curie temperatures of and initially increase with Al content reaching a maximum of 125 °C at x = 0.5 and 135 °C at x = 1.0, respectively. Further Al substitution decreases TC. The coercive fields of optimally annealed nanocrystalline powders decrease slightly from 153 kA/m for x = 0.0–139 kA/m for x = 0.8 and drops to 38 kA/m for x = 2.0. XRD data indicates that lattice parameters of continuously increase with Al content. The simultaneous refinement of X-ray and neutron diffraction patterns confirms that Mo prefers 8i sites in the ThMn12 structure and that Al occupies equally 8i and 8j in a ratio of 1:2.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2019 |
| Autor(en): | Simon, D. ; Wuest, H. ; Koehler, T. ; Senyshyn, A. ; Ehrenberg, H. ; Gutfleisch, O. |
| Art des Eintrags: | Bibliographie |
| Titel: | The quaternary system Sm-Fe-Mo-Al and the effect of Al substitution on magnetic and structural properties of its ThMn12 phase |
| Sprache: | Englisch |
| Publikationsjahr: | 5 Januar 2019 |
| Verlag: | ELSEVIER SCIENCE SA, LAUSANNE, SWITZERLAND |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of Alloys and Compounds |
| Jahrgang/Volume einer Zeitschrift: | 770 |
| DOI: | 10.1016/j.jallcom.2018.08.030 |
| URL / URN: | https://doi.org/10.1016/j.jallcom.2018.08.030 |
| Kurzbeschreibung (Abstract): | The Fe-rich corner of the quaternary system Sm-Fe-Mo-Al is studied at isothermal conditions. The phase equilibria of ferromagnetic with adjacent phases, especially , are observed for 1000 °C. Existence ranges are studied by SEM/EDX on samples with various compositions. Magnetic and structural properties were obtained by VSM(PPMS) as well as Permagraph measurements while structural relations were tracked by XRD. Al can be substituted for Fe up to x = 6.5 accompanied by a decrease in high field (8 MA/m 10 T) polarization from 0.66 T (x = 0.0) to 0.44 T (x = 2.0). Respective Curie temperatures of and initially increase with Al content reaching a maximum of 125 °C at x = 0.5 and 135 °C at x = 1.0, respectively. Further Al substitution decreases TC. The coercive fields of optimally annealed nanocrystalline powders decrease slightly from 153 kA/m for x = 0.0–139 kA/m for x = 0.8 and drops to 38 kA/m for x = 2.0. XRD data indicates that lattice parameters of continuously increase with Al content. The simultaneous refinement of X-ray and neutron diffraction patterns confirms that Mo prefers 8i sites in the ThMn12 structure and that Al occupies equally 8i and 8j in a ratio of 1:2. |
| Freie Schlagworte: | ThMn12 phase, Al substitution, Permanent magnet, Structural analysis, Kerr microscopy |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Funktionale Materialien |
| Hinterlegungsdatum: | 19 Nov 2018 08:24 |
| Letzte Änderung: | 23 Jan 2019 08:43 |
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