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Title: Development of MnBi permanent magnet: neutron diffraction of MnBi powder

Abstract

MnBi attracts great attention in recent years for its great potential as permanent magnet materials. MnBi phase is difficult to obtain because of the rather drastic peritectic reaction between Mn and Bi. In this paper, we report our effort on synthesizing high purity MnBi compound using conventional powder metallurgical approaches. Neutron diffraction was carried out to investigate the crystal and nuclear structure of the obtained power. The result shows that the purity of the obtained powder is about 91wt.% at 300K, and the magnetic moment of the Mn atom in MnBi lattice is 4.424 and 4.013 μB at 50 K and 300 K respectively.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1133985
Report Number(s):
PNNL-SA-98434
CJ0100000
DOE Contract Number:
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics, 115(17):Article No. 17A743
Country of Publication:
United States
Language:
English
Subject:
MnBi; permanent magnet; neutron diffraction; magnetic structure

Citation Formats

Cui, Jun, Choi, Jung-Pyung, Li, Guosheng, Polikarpov, Evgueni, Darsell, Jens T., Kramer, Matthew J., Zarkevich, Nikolai, Wang, L. L., Johnson, D. D., Marinescu, Melania, Huang, Qingzhen, Wu, Hui, Vuong, Nguyen V., and Liu, J.Ping. Development of MnBi permanent magnet: neutron diffraction of MnBi powder. United States: N. p., 2014. Web. doi:10.1063/1.4867230.
Cui, Jun, Choi, Jung-Pyung, Li, Guosheng, Polikarpov, Evgueni, Darsell, Jens T., Kramer, Matthew J., Zarkevich, Nikolai, Wang, L. L., Johnson, D. D., Marinescu, Melania, Huang, Qingzhen, Wu, Hui, Vuong, Nguyen V., & Liu, J.Ping. Development of MnBi permanent magnet: neutron diffraction of MnBi powder. United States. doi:10.1063/1.4867230.
Cui, Jun, Choi, Jung-Pyung, Li, Guosheng, Polikarpov, Evgueni, Darsell, Jens T., Kramer, Matthew J., Zarkevich, Nikolai, Wang, L. L., Johnson, D. D., Marinescu, Melania, Huang, Qingzhen, Wu, Hui, Vuong, Nguyen V., and Liu, J.Ping. 2014. "Development of MnBi permanent magnet: neutron diffraction of MnBi powder". United States. doi:10.1063/1.4867230.
@article{osti_1133985,
title = {Development of MnBi permanent magnet: neutron diffraction of MnBi powder},
author = {Cui, Jun and Choi, Jung-Pyung and Li, Guosheng and Polikarpov, Evgueni and Darsell, Jens T. and Kramer, Matthew J. and Zarkevich, Nikolai and Wang, L. L. and Johnson, D. D. and Marinescu, Melania and Huang, Qingzhen and Wu, Hui and Vuong, Nguyen V. and Liu, J.Ping},
abstractNote = {MnBi attracts great attention in recent years for its great potential as permanent magnet materials. MnBi phase is difficult to obtain because of the rather drastic peritectic reaction between Mn and Bi. In this paper, we report our effort on synthesizing high purity MnBi compound using conventional powder metallurgical approaches. Neutron diffraction was carried out to investigate the crystal and nuclear structure of the obtained power. The result shows that the purity of the obtained powder is about 91wt.% at 300K, and the magnetic moment of the Mn atom in MnBi lattice is 4.424 and 4.013 μB at 50 K and 300 K respectively.},
doi = {10.1063/1.4867230},
journal = {Journal of Applied Physics, 115(17):Article No. 17A743},
number = ,
volume = ,
place = {United States},
year = 2014,
month = 3
}
  • MnBi attracts great attention in recent years for its great potential as permanent magnet materials. MnBi phase is difficult to obtain because of the rather drastic peritectic reaction between Mn and Bi. In this paper, we report our effort on synthesizing high purity MnBi compound using conventional powder metallurgical approaches. Neutron diffraction was carried out to investigate the crystal and nuclear structure of the obtained powder. The result shows that the purity of the obtained powder is about 91 wt. % at 300 K, and the magnetic moment of the Mn atom in MnBi lattice is 4.424 and 4.013 μmore » B at 50 K and 300 K, respectively.« less
  • MnBi attracts great attention in recent years for its great potential as permanent magnet materials. MnBi phase is difficult to obtain because of the rather drastic peritectic reaction between Mn and Bi. In this paper, we report our effort on synthesizing high purity MnBi compound using conventional powder metallurgical approaches. Neutron diffraction was carried out to investigate the crystal and nuclear structure of the obtained powder. The result shows that the purity of the obtained powder is about 91 wt. % at 300 K, and the magnetic moment of the Mn atom in MnBi lattice is 4.424 and 4.013 mu(B)more » at 50 K and 300 K, respectively. (C) 2014 AIP Publishing LLC.« less
  • MnBi attracts great attention in recent years for its great potential as permanent magnet materials. MnBi phase is difficult to obtain because of the rather drastic peritectic reaction between Mn and Bi. In this paper, we report our effort on synthesizing high purity MnBi compound using conventional powder metallurgical approaches. Neutron diffraction was carried out to investigate the crystal and nuclear structure of the obtained powder. The result shows that the purity of the obtained powder is about 91 wt. % at 300 K, and the magnetic moment of the Mn atom in MnBi lattice is 4.424 and 4.013 μ{sub B} at 50 Kmore » and 300 K, respectively.« less
  • Low-temperature MnBi (hexagonal NiAs phase) exhibits anomalies in the lattice constants (a, c) and bulk elastic modulus (B) below 100 K, spin reorientation and magnetic susceptibility maximum near 90 K, and, importantly for high-temperature magnetic applications, an increasing coercivity (unique to MnBi) above 180 K. We calculate the total energy and magneto-anisotropy energy (MAE) versus (a, c) using DFT+U methods. We reproduce and explain all the above anomalies. We predict that coercivity and MAE increase due to increasing a, suggesting means to improve MnBi permanent magnets.
  • Low-temperature MnBi (hexagonal NiAs phase) exhibits anomalies in the lattice constants (a, c) and bulk elastic modulus (B) below 100 K, spin reorientation and magnetic susceptibility maximum near 90 K, and, importantly for high-temperature magnetic applications, an increasing coercivity (unique to MnBi) above 180 K. We calculate the total energy and magneto-anisotropy energy (MAE) versus (a, c) using DFT+U methods. We reproduce and explain all the above anomalies. We predict that coercivity and MAE increase due to increasing a, suggesting means to improve MnBi permanent magnets. (C) 2014 Author(s).