Fabrication of anisotropic MnBi nanoparticles by mechanochemical process

MnBi nanoparticles with size in the range 100–300nm were fabricated from a mixture of Bi2O3 and Mn in the presence of Ca as reducing element by a mechanochemical process. Heat treatment of as-milled powder and subsequent washing yielded nanoparticles with composite morphology of MnBi/Bi. Nanoparticl...

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Bibliographic Details
Published in:Journal of alloys and compounds 2014-02, Vol.586, p.349-352
Main Authors: Rama Rao, N.V., Gabay, A.M., Hu, X., Hadjipanayis, G.C.
Format: Article
Language:English
Subjects:
Alloys
Anisotropy
Coercive force
Composite materials
Cross-disciplinary physics: materials science
rheology
Crystallography
Exact sciences and technology
Manganese
Materials science
Mechanochemical process
Methods of nanofabrication
MnBi
Nanocomposites
Nanoparticles
Physics
Rare earth free magnets
Remanence
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Summary:MnBi nanoparticles with size in the range 100–300nm were fabricated from a mixture of Bi2O3 and Mn in the presence of Ca as reducing element by a mechanochemical process. Heat treatment of as-milled powder and subsequent washing yielded nanoparticles with composite morphology of MnBi/Bi. Nanoparticles were crystallographically anisotropic and displayed high remanence ratio (Mr/Ms) of 0.94 and high coercivity (Hc) of 16.3kOe at room temperature. The spin reorientation temperature of the MnBi nanoparticles was found to be at 119K showing an increase by 10K as compared to the bulk sample.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2013.10.067