Chen, Yu-Chun ; Sawatzki, Simon ; Ener, Semih ; Sepehri-Amin, Hossein ; Leineweber, Andreas ; Gregori, Giuliano ; Qu, Fei ; Muralidhar, Shreyas ; Ohkubo, Tadakatsu ; Hono, Kazuhiro ; Gutfleisch, Oliver ; Kronmüller, Helmut ; Schütz, Gisela ; Goering, Eberhard (2016)
On the synthesis and microstructure analysis of high performance MnBi.
In: AIP Advances, 6 (12)
doi: 10.1063/1.4971759
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Highly anisotropic MnBi powder with over 90 wt% low-temperature phase can be prepared using conventional arc-melting and 2 hour-low energy ball milling (BM) followed by magnetic separation. After proper alignment, the purified Mn55Bi45(Mn45Bi55) powder show remarkable magnetic properties: mass remanence of 71(65) Am2/kg and coercivity of 1.23(1.18) T at 300 K. The nominal maximum energy product of 120 kJ/m3 is achieved in the purified 2h-BM Mn55Bi45 powder, close to theoretical value of 140.8 kJ/m3. The Mn55Bi45(Mn45Bi55) bulk magnets show the highest volume remanence of 0.68(0.57) T at 300 K, while they were consolidated at 573(523) K by a pressure of 200 MPa for 5 minutes using hot-compaction method. In addition to the observed grain size, the coercivity of the hot-compacted samples at 300 K was found to be strongly related to the amount of metallic Mn and Bi residue at the grain-boundary. Our study proves that the magnetic properties of the Mn45Bi55 bulk magnets are stable up to 500 K, and the nominal (BH)max values are still above 40 kJ/m3 at 500 K showing the potential ability for high-temperature applications.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2016 |
| Autor(en): | Chen, Yu-Chun ; Sawatzki, Simon ; Ener, Semih ; Sepehri-Amin, Hossein ; Leineweber, Andreas ; Gregori, Giuliano ; Qu, Fei ; Muralidhar, Shreyas ; Ohkubo, Tadakatsu ; Hono, Kazuhiro ; Gutfleisch, Oliver ; Kronmüller, Helmut ; Schütz, Gisela ; Goering, Eberhard |
| Art des Eintrags: | Bibliographie |
| Titel: | On the synthesis and microstructure analysis of high performance MnBi |
| Sprache: | Englisch |
| Publikationsjahr: | 2016 |
| Verlag: | AIP Publishing |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | AIP Advances |
| Jahrgang/Volume einer Zeitschrift: | 6 |
| (Heft-)Nummer: | 12 |
| DOI: | 10.1063/1.4971759 |
| Kurzbeschreibung (Abstract): | Highly anisotropic MnBi powder with over 90 wt% low-temperature phase can be prepared using conventional arc-melting and 2 hour-low energy ball milling (BM) followed by magnetic separation. After proper alignment, the purified Mn55Bi45(Mn45Bi55) powder show remarkable magnetic properties: mass remanence of 71(65) Am2/kg and coercivity of 1.23(1.18) T at 300 K. The nominal maximum energy product of 120 kJ/m3 is achieved in the purified 2h-BM Mn55Bi45 powder, close to theoretical value of 140.8 kJ/m3. The Mn55Bi45(Mn45Bi55) bulk magnets show the highest volume remanence of 0.68(0.57) T at 300 K, while they were consolidated at 573(523) K by a pressure of 200 MPa for 5 minutes using hot-compaction method. In addition to the observed grain size, the coercivity of the hot-compacted samples at 300 K was found to be strongly related to the amount of metallic Mn and Bi residue at the grain-boundary. Our study proves that the magnetic properties of the Mn45Bi55 bulk magnets are stable up to 500 K, and the nominal (BH)max values are still above 40 kJ/m3 at 500 K showing the potential ability for high-temperature applications. |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Funktionale Materialien 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften |
| Hinterlegungsdatum: | 17 Jan 2017 12:49 |
| Letzte Änderung: | 17 Jan 2017 12:49 |
| PPN: | |
| Sponsoren: | The authors gratefully acknowledge the support of the Deutsche Forschungsgemeinschaft for the project HPPMSNG and German federal state of Hessen for the program LOEWE RESPONSE, respectively. |
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