Maximizing the hard magnetic properties of melt-spun Ce–La–Fe–B alloys
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To balance the utilization of rare earth (RE) resource and develop Ce-based permanent magnets with high performance/cost ratio, the role of La substitution in the melt-spun (Ce1−xLax)yFe14B (x = 0–0.4, and 0.5; y = 2–4) alloys has been investigated. It has been confirmed that the hard magnetic properties of Ce-based magnets can be effectively enhanced by partial substitution of La. The maximum (BH)max of (Ce,La)–Fe–B alloys can be obtained at a Ce:La atomic ratio of 7:3. The lattice parameters and Curie temperature of the hard magnetic (Ce/La)2Fe14B phase increase linearly with increasing La content. Three different alloy systems with y = 2, 2.5 and 3 show similar behavior of magnetic properties dependences on La. In the RE-rich compositions, La substitution for Ce can effectively inhibit the precipitation of the CeFe2 phase. A solid solution, Ce(La) phase with a space group of Fm-3m, appears in the (Ce0.7La0.3)yFe14B alloys with y ≥ 3.5. A good combination of magnetic properties with Hcj = 345 kA/m, J5T = 1.03 T, Jr = 0.60 T, and (BH)max= 6.3 MGOe is obtained in (Ce0.7La0.3)2.5Fe14B alloy. In addition, 30 at.% La substitution for Ce can significantly refine the grains, resulting in the enhancement of exchange coupling interaction. The present finding is beneficial for designing new and low-cost magnetic materials.
The authors acknowledge the financial supports from the National Natural Science Foundation of China (Grant No. 51774146), and the Guangzhou Municipal Science and Technology Program (Grant No. 201707010161).
- 17.Fuerst CD, Capehart TW, Pinkerton FE, Herbst JF (1995) Preparation and characterization of La2−xCexFe14B compounds. J Magn Magn Mater 139:359–363Google Scholar
- 24.Zhao LZ, Yu HY, Guo WT, Zhang JS, Zhang ZY, Hussain M, Liu ZW, Greneche JM (2017) Phase and hyperfine structures of melt spun nanocrystalline (Ce1-xNdx)16Fe78B6 alloys. IEEE Trans Magn 53:1800205 Google Scholar