Magnetic properties of Lutetium and Yttrium doped Ce₂Fe₁₄B magnets

Journal Article · Mon Feb 05 00:00:00 EST 2024

DOI:https://doi.org/10.2139/ssrn.4745095· OSTI ID:2406863

Rai, Binod K. ^[1]; Bretana, Alex ^[1]; Housley, Catherine E. ^[1]; Ajo, Henry ^[1]; Koenig, Tucker D. ^[1]; Li, Wenxia ^[1]; Conner, Benjamin S. ^[1]; Ward, Patrick A. ^[1]; Greer, Rosalie ^[1]; Morrison, Gregory ^[2]; Loye, Hans-Conrad zur ^[3]; Rai, Binod K.

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1. Savannah River National Laboratory (SRNL), Aiken, SC (United States)
2. Univ. of South Carolina, Columbia, SC (United States)
3. University of South Carolina, Columbia, SC; Savannah River National Laboratory (SRNL), Aiken, SC (United States)

The increasing demand for Nd-Dy and Sm-Co based permanent magnets is exacerbating the current critical materials shortage, therefore improving and optimizing current candidate critical element free permanent magnets is necessary to develop future clean energy technologies. In this work, we aim to increase the thermal stability and magnetic performance of Ce₂Fe₁₄B based permanent magnets through the substitution of Ce ions with noncritical rare earth elements Lu and Y. The substitution of Lu (x=0; 0.05; 0.1; 0.15) for Ce ions in (LuxCe_2-x)Fe₁₄B was unsuccessful, likely due to disparities in ionic size and valencies, and failed to exhibit improved thermal stability or magnetic performance. In contrast, Y substitution for Ce ions in (Y_xCe_2-x)Fe14B (x= 0.1; 0.2; 0.3; 0.4; 0.5) alloys was successful. Notably, these alloys demonstrated enhanced thermal stability, as evidenced by an increase in the Curie temperature, reaching a peak of 443 K at x= 0.5. Y substitution also helped to suppress the CeFe2 Laves phase. Without loss of the anisotropy field Y substitution increased the saturation magnetization, MS, peaking at MS = 125 emu/g for a Y concentration of x= 0:4, demonstrating (Y_0.4Ce_1.6)Fe₁₄B as a potential critical element free permanent magnet with an energy product as high as 29 MGOe. This work is advantageous in developing low cost high performance permanent magnets with reduced or little to no critical rare earth elements.

• Research Organization: Savannah River National Laboratory (SRNL), Aiken, SC (United States)
• Sponsoring Organization: USDOE Office of Environmental Management (EM)
• DOE Contract Number: 89303321CEM000080
• OSTI ID: 2406863
• Report Number(s): SRNL--STI-2024-00044
• Country of Publication: United States
• Language: English