Rapid phase formation and magnetocaloric properties of off-stoichiometric LaCe0.3Fe11Co0.8Si1.2 strip-casting flakes

IF 2.5 3区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Magnetism and Magnetic Materials Pub Date : 2025-04-30 DOI:10.1016/j.jmmm.2025.173134

H.X. Yu , X.C. Zhong , X. Huang , J.H. Huang , C.L. Liu , Y.D. Zhang , Z.W. Liu , R.V. Ramanujan

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Abstract

The rapid phase formation and magnetocaloric properties of LaCe_0.3Fe₁₁Co_0.8Si_1.2 strip-casting flakes annealed at 1373 K for durations varying from 2 min to 24 h were investigated. The rare earth elements refined the microstructure into a fine lamellar structure, which promoted the formation of the NaZn₁₃-type structure (1:13) phase. Consequently, a high 1:13 phase content of 88.5 wt% was obtained within only 5 min at 1373 K. The Johnson-Mehl-Avrami-Kolmogorov (JMAK) fitting results revealed that the rapid formation of the 1:13 phase resulted from the thickening of large lamellar precipitates. After annealing for 6 h, the maximum 1:13 phase content of 95.6 wt% was obtained, along with a maximum magnetic entropy change (−ΔS_M)^max of 10.6 J·kg⁻¹·K⁻¹ and a relative cooling power (RCP) of 151.6 J·kg⁻¹ (Δμ₀H = 2 T). The large (−ΔS_M)^max and RCP values, as well as short annealing time, make these alloys promising candidates as magnetic refrigerants for near room temperature applications.

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非化学计量LaCe0.3Fe11Co0.8Si1.2带状铸片的快速相形成和磁热性能

研究了LaCe0.3Fe11Co0.8Si1.2带状铸片在1373 K下退火2 min ~ 24 h后的快速相形成和磁热性能。稀土元素使微观组织细化为精细的片层结构，促进了nazn13型（1:13）相的形成。因此，在1373 K下，仅在5分钟内就获得了高达88.5 wt%的1:13相含量。Johnson-Mehl-Avrami-Kolmogorov （JMAK）拟合结果表明，1:13相的快速形成是由于大层状析出物的增厚。退火6 h后，获得了最大1:13相含量为95.6% wt%，最大磁熵变化（- ΔSM）max为10.6 J·kg−1·K−1，相对冷却功率（RCP）为151.6 J·kg−1 （Δμ0H = 2 T）。较大的（−ΔSM）max和RCP值，以及较短的退火时间，使这些合金有希望成为近室温应用的磁性制冷剂。

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来源期刊

Journal of Magnetism and Magnetic Materials 物理-材料科学：综合

CiteScore

5.30

自引率

11.10%

发文量

1149

审稿时长

59 days

期刊介绍： The Journal of Magnetism and Magnetic Materials provides an important forum for the disclosure and discussion of original contributions covering the whole spectrum of topics, from basic magnetism to the technology and applications of magnetic materials. The journal encourages greater interaction between the basic and applied sub-disciplines of magnetism with comprehensive review articles, in addition to full-length contributions. In addition, other categories of contributions are welcome, including Critical Focused issues, Current Perspectives and Outreach to the General Public. Main Categories: Full-length articles: Technically original research documents that report results of value to the communities that comprise the journal audience. The link between chemical, structural and microstructural properties on the one hand and magnetic properties on the other hand are encouraged. In addition to general topics covering all areas of magnetism and magnetic materials, the full-length articles also include three sub-sections, focusing on Nanomagnetism, Spintronics and Applications. The sub-section on Nanomagnetism contains articles on magnetic nanoparticles, nanowires, thin films, 2D materials and other nanoscale magnetic materials and their applications. The sub-section on Spintronics contains articles on magnetoresistance, magnetoimpedance, magneto-optical phenomena, Micro-Electro-Mechanical Systems (MEMS), and other topics related to spin current control and magneto-transport phenomena. The sub-section on Applications display papers that focus on applications of magnetic materials. The applications need to show a connection to magnetism. Review articles: Review articles organize, clarify, and summarize existing major works in the areas covered by the Journal and provide comprehensive citations to the full spectrum of relevant literature.