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On the synthesis and microstructure analysis of high performance MnBi

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), p. 125301. AIP Publishing, ISSN 2158-3226,
[Article]

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.

Item Type: Article
Erschienen: 2016
Creators: 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
Title: On the synthesis and microstructure analysis of high performance MnBi
Language: English
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.

Journal or Publication Title: AIP Advances
Journal Volume: 6
Issue Number: 12
Publisher: AIP Publishing
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Functional Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 17 Jan 2017 12:49
URL / URN: http://dx.doi.org/10.1063/1.4971759
Identification Number: doi:10.1063/1.4971759
Funders: 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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