中国物理B ›› 2025, Vol. 34 ›› Issue (8): 88202-088202.doi: 10.1088/1674-1056/adce94

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Microstructural evolution and magnetocaloric properties of off-stoichiometric La1.2Fe11.6Si1.4 alloys with interstitial C atoms

Huiyan Zhang(张慧燕)1,2,†, Ye Zhu(朱叶)2, Fucheng Zhu(朱福成)2, Yang Xu(许旸)2, Yunbo Chen(陈云博)2, Hailing Li(李海玲)1,2, Weihua Gu(顾未华)1,2, Zhiyuan Liu(刘志愿)1,2, Weihuo Li(李维火)2,3, and Ailin Xia(夏爱林)1,2   

  1. 1 Advanced Ceramics Research Center, School of Materials Science and Engineering, Anhui University of Technology, Maanshan 243002, China;
    2 School of Material Science and Engineering, Anhui University of Technology, Maanshan 243002, China;
    3 Wuhu Technology and Innovation Research Institute, Anhui University of Technology, Wuhu 241003, China
  • 收稿日期:2025-01-20 修回日期:2025-03-31 接受日期:2025-04-21 出版日期:2025-07-17 发布日期:2025-08-12
  • 通讯作者: Huiyan Zhang E-mail:hyzh2017@ahut.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 52272263), the University Synergy Innovation Program of Anhui Province, China (Grant No. GXXT-2022-008), the University Natural Science Research Project of Anhui Province, China (Grant No. 2024AH050145), the Youth Foundation of Anhui University of Technology (Grant No. QZ202303), and the National Innovation and Entrepreneurship Training Program for College Students (Grant No. 202310360018).

Microstructural evolution and magnetocaloric properties of off-stoichiometric La1.2Fe11.6Si1.4 alloys with interstitial C atoms

Huiyan Zhang(张慧燕)1,2,†, Ye Zhu(朱叶)2, Fucheng Zhu(朱福成)2, Yang Xu(许旸)2, Yunbo Chen(陈云博)2, Hailing Li(李海玲)1,2, Weihua Gu(顾未华)1,2, Zhiyuan Liu(刘志愿)1,2, Weihuo Li(李维火)2,3, and Ailin Xia(夏爱林)1,2   

  1. 1 Advanced Ceramics Research Center, School of Materials Science and Engineering, Anhui University of Technology, Maanshan 243002, China;
    2 School of Material Science and Engineering, Anhui University of Technology, Maanshan 243002, China;
    3 Wuhu Technology and Innovation Research Institute, Anhui University of Technology, Wuhu 241003, China
  • Received:2025-01-20 Revised:2025-03-31 Accepted:2025-04-21 Online:2025-07-17 Published:2025-08-12
  • Contact: Huiyan Zhang E-mail:hyzh2017@ahut.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 52272263), the University Synergy Innovation Program of Anhui Province, China (Grant No. GXXT-2022-008), the University Natural Science Research Project of Anhui Province, China (Grant No. 2024AH050145), the Youth Foundation of Anhui University of Technology (Grant No. QZ202303), and the National Innovation and Entrepreneurship Training Program for College Students (Grant No. 202310360018).

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摘要： This study investigated the effects of interstitial carbon doping on the microstructural and magnetocaloric properties of off-stoichiometric La$_{1.2}$Fe$_{11.6}$Si$_{1.4}$C$_{x}$ ($x = 0$, 0.25, 0.5, 0.75, 1) alloys. The alloys were prepared by melt-spinning following vacuum arc-melting. For the as-prepared and annealed samples, the carbon existed in the La$_{2}$Fe$_{2}$Si$_{2}$C and NaZn$_{13}$-type La(Fe, Si)$_{13}$ (denoted by 1:13) phases, respectively. During the annealing process, the C atoms inhibited the diffusion reaction and depressed the generation of 1:13 phase, reducing mass fraction of the 1:13 phase in annealed La$_{1.2}$Fe$_{11.6}$Si$_{1.4}$C$_{x} $ compounds. The introduction of carbon resulted in lattice expansion and increased the Curie temperature ($T_{\rm C}$) from 192 K to 273 K with $x = 0.5$. The first-order magnetic transition was gradually transformed into the second-order magnetic transition with increasing carbon content, which induced the significant reduction of thermal and magnetic hysteresis, as well as the maximum magnetic entropy change and adiabatic temperature change vary from 18.92 J/(kg$\cdot$K) to 4.60 J/(kg$\cdot$K) and from 4.9 K to 2.2 K under an applied field change of 0-2 T. The results demonstrate that interstitial carbon doping is an effective strategy to improve the magnetocaloric performance of La(Fe,Si)$_{13}$ alloys.

关键词: interstitial C addition, off-stoichiometric La(Fe,Si)$_{13}$ alloy, magnetocaloric effect, magnetic transition

Abstract: This study investigated the effects of interstitial carbon doping on the microstructural and magnetocaloric properties of off-stoichiometric La$_{1.2}$Fe$_{11.6}$Si$_{1.4}$C$_{x}$ ($x = 0$, 0.25, 0.5, 0.75, 1) alloys. The alloys were prepared by melt-spinning following vacuum arc-melting. For the as-prepared and annealed samples, the carbon existed in the La$_{2}$Fe$_{2}$Si$_{2}$C and NaZn$_{13}$-type La(Fe, Si)$_{13}$ (denoted by 1:13) phases, respectively. During the annealing process, the C atoms inhibited the diffusion reaction and depressed the generation of 1:13 phase, reducing mass fraction of the 1:13 phase in annealed La$_{1.2}$Fe$_{11.6}$Si$_{1.4}$C$_{x} $ compounds. The introduction of carbon resulted in lattice expansion and increased the Curie temperature ($T_{\rm C}$) from 192 K to 273 K with $x = 0.5$. The first-order magnetic transition was gradually transformed into the second-order magnetic transition with increasing carbon content, which induced the significant reduction of thermal and magnetic hysteresis, as well as the maximum magnetic entropy change and adiabatic temperature change vary from 18.92 J/(kg$\cdot$K) to 4.60 J/(kg$\cdot$K) and from 4.9 K to 2.2 K under an applied field change of 0-2 T. The results demonstrate that interstitial carbon doping is an effective strategy to improve the magnetocaloric performance of La(Fe,Si)$_{13}$ alloys.

Key words: interstitial C addition, off-stoichiometric La(Fe,Si)$_{13}$ alloy, magnetocaloric effect, magnetic transition

中图分类号:  (Association, addition, insertion, cluster formation)

  • 82.30.Nr
75.47.Np (Metals and alloys) 75.30.Sg (Magnetocaloric effect, magnetic cooling) 75.30.Kz (Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.))