Effect of Sb substitution on crystal structure, texture and hard magnetic properties of melt-spun MnBi alloys
Abstract
Melt-spun Mn50Bi50-xSbx alloys with x ≤ 5 were prepared at different solidification rates and characterized both in the as-spun state and after annealing. In the as-spun alloys, the Sb substitution leads to the formation of a metastable phase, similar to the binary "quenched high-temperature phase" but without the superstructure of the latter and exhibiting a different – increasing – temperature dependence of coercivity. The new nanocrystalline metastable phase is not only itself characterized by a high room-temperature coercivity (in excess of 20 kOe), but upon annealing it transforms into a high-coercivity (up to 13.5 kOe) "low-temperature" α phase. However, the advantage of obtaining a high coercivity without the otherwise required milling made possible by the Sb substitution is undermined by the absence of a local crystallographic texture in the melt-spun alloys. The best combination of the isotropic hard magnetic properties realized for the Mn55Bi43.5Sb1.5 composition is a remanence of 35.5 emu/g and a coercivity of 8.1 kOe. The annealed Sb-free Mn50Bi50 alloys did possess a local crystallographic alignment and, for high solidification rates, a moderate coercivity up to 5.6 kOe; however, they had an inadequate "rectangularity" in the demagnetization curve. The orthorhombic compound known as MnBi0.9Sb0.1 and described earlier asmore »
- Authors:
-
- Univ. of Delaware, Newark, DE (United States)
- Iowa State Univ., Ames, IA (United States)
- Publication Date:
- Research Org.:
- Univ. of Delaware, Newark, DE (United States); Iowa State Univ., Ames, IA (United States)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE)
- OSTI Identifier:
- 1504700
- Alternate Identifier(s):
- OSTI ID: 1547551; OSTI ID: 1864016
- Grant/Contract Number:
- EE0007794
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Alloys and Compounds
- Additional Journal Information:
- Journal Volume: 792; Journal ID: ISSN 0925-8388
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; intermetallics; permanent magnets; nanostructured materials; rapid solidification; crystal structure; magnetization; MnBi
Citation Formats
Gabay, Alexander, Hadjipanayis, George, and Cui, Jun. Effect of Sb substitution on crystal structure, texture and hard magnetic properties of melt-spun MnBi alloys. United States: N. p., 2019.
Web. doi:10.1016/j.jallcom.2019.03.407.
Gabay, Alexander, Hadjipanayis, George, & Cui, Jun. Effect of Sb substitution on crystal structure, texture and hard magnetic properties of melt-spun MnBi alloys. United States. https://doi.org/10.1016/j.jallcom.2019.03.407
Gabay, Alexander, Hadjipanayis, George, and Cui, Jun. Wed .
"Effect of Sb substitution on crystal structure, texture and hard magnetic properties of melt-spun MnBi alloys". United States. https://doi.org/10.1016/j.jallcom.2019.03.407. https://www.osti.gov/servlets/purl/1504700.
@article{osti_1504700,
title = {Effect of Sb substitution on crystal structure, texture and hard magnetic properties of melt-spun MnBi alloys},
author = {Gabay, Alexander and Hadjipanayis, George and Cui, Jun},
abstractNote = {Melt-spun Mn50Bi50-xSbx alloys with x ≤ 5 were prepared at different solidification rates and characterized both in the as-spun state and after annealing. In the as-spun alloys, the Sb substitution leads to the formation of a metastable phase, similar to the binary "quenched high-temperature phase" but without the superstructure of the latter and exhibiting a different – increasing – temperature dependence of coercivity. The new nanocrystalline metastable phase is not only itself characterized by a high room-temperature coercivity (in excess of 20 kOe), but upon annealing it transforms into a high-coercivity (up to 13.5 kOe) "low-temperature" α phase. However, the advantage of obtaining a high coercivity without the otherwise required milling made possible by the Sb substitution is undermined by the absence of a local crystallographic texture in the melt-spun alloys. The best combination of the isotropic hard magnetic properties realized for the Mn55Bi43.5Sb1.5 composition is a remanence of 35.5 emu/g and a coercivity of 8.1 kOe. The annealed Sb-free Mn50Bi50 alloys did possess a local crystallographic alignment and, for high solidification rates, a moderate coercivity up to 5.6 kOe; however, they had an inadequate "rectangularity" in the demagnetization curve. The orthorhombic compound known as MnBi0.9Sb0.1 and described earlier as antiferromagnetic was obtained in the annealed ribbons with x ≈ 5. The compound was found to order ferromagnetically between 200 K and ≈250 K and to exhibit a significant coercivity, 14.3 kOe at 50 K. Here, it is suggested that the MnBi0.9Sb0.1 may actually be a Sb-stabilized "new phase" observed earlier as metastable in the Bi–MnBi eutectic alloys.},
doi = {10.1016/j.jallcom.2019.03.407},
journal = {Journal of Alloys and Compounds},
number = ,
volume = 792,
place = {United States},
year = {Wed Apr 03 00:00:00 EDT 2019},
month = {Wed Apr 03 00:00:00 EDT 2019}
}
Web of Science
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