ThMn12-Type Alloys for Permanent Magnets

Hadjipanayis, G. C.; Gabay, A. M.; Schönhöbel, A. M.; Martín-Cid, A.; Barandiaran, J. M.; Niarchos, D.

doi:10.1016/j.eng.2018.12.011

Title: ThMn12-Type Alloys for Permanent Magnets

Journal Article · Sat Feb 01 00:00:00 EST 2020 · Engineering

DOI:https://doi.org/10.1016/j.eng.2018.12.011· OSTI ID:1567974

Hadjipanayis, G. C.; Gabay, A. M.; Schönhöbel, A. M.; Martín-Cid, A.; Barandiaran, J. M.; Niarchos, D.

Iron-rich compounds with the tetragonal ThMn₁₂-type structure have the potential to meet current demands for rare-earth-lean permanent magnets with high energy density and operating temperatures of 150–200 °C. However, while it is normal for magnet technology to lag behind the development of underlying magnetic material, this gap has always been unusually large for ThMn₁₂-type magnets. The gap has widened further in recent years, as excellent combinations of intrinsic magnetic properties have been obtained in compounds synthesized with a smaller amount of structure-stabilizing elements (e.g., SmFe₁₁V or Sm_0.8Zr_0.2Fe_9.2Co_2.3Ti_0.5) or with no such elements (i.e., SmFe_9.6Co_2.4 thin films). The search for promising compounds continues—with increasing help coming from theoretical calculations. Unfortunately, progress in the development of magnets beyond polymer-bonded interstitially modified powders remains marginal. The introduction of lanthanum (La) was found to stabilize low-melting-temperature minority phases in Sm(Fe,Ti)₁₂ alloys, thus allowing for liquid-phase sintering for the first time. The high reactivity of La, however, has apparently undermined the development of coercivity (H_c). A controlled crystallization of the initially suppressed ThMn₁₂-type phase makes “bulk” magnetic hardening possible, not only in Sm–Fe–V alloys (in which it has been known since the 1990s), but also is in La-added (Ce,Sm)(Fe,Ti)₁₂ alloys. The properties of the bulk-hardened alloys, however, remain unsatisfactory. Mechanochemically synthesized (Sm,Zr)(Fe,Si)₁₂ and (Sm,Zr)(Fe,Co,Ti)₁₂ powders may become suitable for sintering into powerful fully dense magnets, although not before a higher degree of anisotropy in both alloys and a higher H_c in the latter alloy have been developed.

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Research Organization:: Univ. of Delaware, Newark, DE (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: FG02-90ER45413

OSTI ID:: 1567974

Alternate ID(s):: OSTI ID: 1800711

Journal Information:: Engineering, Journal Name: Engineering Vol. 6 Journal Issue: 2; ISSN 2095-8099

Publisher:: ElsevierCopyright Statement

Country of Publication:: China

Language:: English

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Cited by: 38 works

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References (43)

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