Thermal stability of MnBi magnetic materials

被引：96

作者：

Cui, J. ^{[1
,2
]}

Choi, J. P. ^{[1
]}

Li, G. ^{[1
]}

Polikarpov, E. ^{[1
]}

Darsell, J. ^{[1
]}

Overman, N. ^{[1
]}

Olszta, M. ^{[1
]}

Schreiber, D. ^{[1
]}

Bowden, M. ^{[3
]}

Droubay, T. ^{[4
]}

Kramer, M. J. ^{[5
,6
]}

Zarkevich, N. A. ^{[5
]}

Wang, L. L. ^{[5
]}

Johnson, D. D. ^{[5
,6
]}

Marinescu, M. ^{[7
]}

Takeuchi, I. ^{[2
]}

Huang, Q. Z. ^{[8
]}

Wu, H. ^{[2
,8
]}

Reeve, H. ^{[9
]}

Vuong, N. V. ^{[10
]}

Liu, J. P. ^{[10
]}

机构：

[1] Pacific NW Natl Lab, Energy & Environm Directorate, Richland, WA 99354 USA

[2] Univ Maryland, Dept Mat Sci & Engn, College Pk, MD 20742 USA

[3] Environm Mol Sci Lab, Richland, WA 99354 USA

[4] Pacific NW Natl Lab, Fundamental & Computat Sci Directorate, Richland, WA 99354 USA

[5] US DOE, Div Mat Sci & Engn, Ames Lab, Ames, IA 50011 USA

[6] Iowa State Univ, Dept Mat Sci & Engn, Ames, IA 50011 USA

[7] Elect Energy Corp, Landisville, PA 17538 USA

[8] Natl Inst Stand & Technol, Ctr Neutron Res, Gaithersburg, MD 20899 USA

[9] United Technol Res Ctr, E Hartford, CT 06108 USA

[10] Univ Texas Arlington, Dept Phys, Arlington, TX 76019 USA

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2014年 / 26卷 / 06期

关键词：

non rare earth permanent magnet; MnBi; thermal decomposition; positive temperature coefficient; INTERMETALLIC COMPOUND; RAPID SOLIDIFICATION; NEUTRON-DIFFRACTION; PHASE;

D O I：

10.1088/0953-8984/26/6/064212

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

MnBi has attracted much attention in recent years due to its potential as a rare-earth-free permanent magnet material. It is unique because its coercivity increases with increasing temperature, which makes it a good hard phase material for exchange coupling nanocomposite magnets. MnBi phase is difficult to obtain, partly because the reaction between Mn and Bi is peritectic, and partly because Mn reacts readily with oxygen. MnO formation is irreversible and harmful to magnet performance. In this paper, we report our efforts toward developing MnBi permanent magnets. To date, high purity MnBi (>90%) can be routinely produced in large quantities. The produced powder exhibits 74.6 emu g(-1) saturation magnetization at room temperature with 9 T applied field. After proper alignment, the maximum energy product (BH)(max) of the powder reached 11.9 MGOe, and that of the sintered bulk magnet reached 7.8 MGOe at room temperature. A comprehensive study of thermal stability shows that MnBi powder is stable up to 473 K in air.

引用

页数：10

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