Tetragonal structure and uniaxial magnetic anisotropy in the arc-melted (Ce,Zr)2(Fe,M)17 (M = Mo, W, Co) alloys

Raja, Akila; Palasyuk, Olena; Schlagel, Deborah; Lograsso, Thomas; Palasyuk, Andriy

doi:10.1016/j.jallcom.2025.179888

Tetragonal structure and uniaxial magnetic anisotropy in the arc-melted (Ce,Zr)₂(Fe,M)₁₇ (M = Mo, W, Co) alloys

Journal Article · Sat Mar 22 00:00:00 EDT 2025 · Journal of Alloys and Compounds

DOI:https://doi.org/10.1016/j.jallcom.2025.179888· OSTI ID:2571445

Raja, Akila ^[1]; Palasyuk, Olena ^[1]; Schlagel, Deborah ^[1]; Lograsso, Thomas ^[1]; Palasyuk, Andriy ^[1]

Ames Laboratory (AMES), Ames, IA (United States)

The tetragonal ThMn₁₂-type structure is stabilized in (Ce_1-xZr_x)₂T₁₆M (x = 0.2 – 0.3; T = Fe or Fe/Co, M = Mo or W) arc-melted alloys. Approximately 5 at% of Mo or W admixture is sufficient to transform the hexagonal Th₂Ni₁₇-type structure of (Ce_1-xZr_x)₂Fe₁₇ into the tetragonal ThMn₁₂-type structure of nearly single-phase (Ce_1-xZr_x)₂Fe₁₆M and/or (Ce_1-xZr_x)₂Fe₁₅CoM bulk alloys. X-ray Rietveld refinements reveal that Zr and Mo (W) substitute different sites in the tetragonal crystal structure. Zirconium preferentially replaces Ce, whereas Mo (W) substitutes Fe. At room temperature, the tetragonal phases exhibit strong ferromagnetism and a uniaxial magneto-crystalline anisotropy with anisotropy fields of 15 – 17 kOe. These materials possess room-temperature saturation magnetizations of 95 – 105 emu/g and Curie temperature of 420 – 505 K. At some concentrations, concurrent Zr and Mo (W) site occupancy facilitates 1:12 structure formation in bulk alloys with minimal presence of non-magnetic element in the Fe sublattice, thus securing the highest known magnetic moment per Fe atom (∼ 1.37 µ_B) in this type of materials. The intrinsic magnetic characteristics, as well as the absence of critical rare earths (RE), make these compounds interesting for development as low-cost permanent magnets. In conclusion, small Co additions improve the Curie temperature, especially if combined with W.

View Accepted Manuscript (DOE)

Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Advanced Materials & Manufacturing Technologies Office (AMMTO)

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 2571445

Alternate ID(s):: OSTI ID: 2536778

Journal Information:: Journal of Alloys and Compounds, Journal Name: Journal of Alloys and Compounds Vol. 1022; ISSN 0925-8388

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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