中国物理B ›› 2009, Vol. 18 ›› Issue (5): 2058-2062.doi: 10.1088/1674-1056/18/5/055

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Effect of R substitution on magnetic properties and magnetocaloric effects of La1-xRxFe11.5Si1.5 compounds with R=Ce, Pr and Nd

李养贤1, 孙继荣2, 沈保根2, 沈俊3   

  1. (1)School of Material Science and Engineering, Hebei University of Technology, Tianjin 300130, China; (2)State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; (3)State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;School of Material Science and Engineering, Hebei University of Technology, Tianjin 300130, China
  • 收稿日期:2008-09-29 出版日期:2009-05-20 发布日期:2009-05-20
  • 基金资助:
    Project supported by the National Basic Research Program of China (Grant No 2006CB601101), the National Natural Science Foundation of China (Grant Nos 50731007 and 50571112) and the Knowledge Innovation Project of Chinese Academy of Sciences.

Effect of R substitution on magnetic properties and magnetocaloric effects of La1-xRxFe11.5Si1.5 compounds with R=Ce, Pr and Nd

Shen Jun(沈俊)a)b)† , Li Yang-Xian(李养贤)b), Sun Ji-Rong(孙继荣)a), and Shen Bao-Gen(沈保根)a)   

  1. a State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, ChinaSchool of Material Science and Engineering, Hebei University of Technology, Tianjin 300130, China; b School of Material Science and Engineering, Hebei University of Technology, Tianjin 300130, China
  • Received:2008-09-29 Online:2009-05-20 Published:2009-05-20
  • Supported by:
    Project supported by the National Basic Research Program of China (Grant No 2006CB601101), the National Natural Science Foundation of China (Grant Nos 50731007 and 50571112) and the Knowledge Innovation Project of Chinese Academy of Sciences.

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摘要： Magnetic properties and magnetocaloric effects of La1-xRxFe11.5Si1.5 (R=Pr, (0 ≤ x ≤ 0.5); R = Ce and Nd, (0 ≤ x ≤ 0.3)) compounds are investigated. Partially replacing La with R = Ce, Pr and Nd in La_{1 - x}RxFe11.5Si1.5 leads to a reduction in Curie temperature due to the lattice contraction. The substitution of R for La causes an enhancement in field-induced itinerant electron metamagnetic transition, which leads to a remarkable increase in magnetic entropy change δ Sm and also in hysteresis loss. However, a high effective refrigerant capacity RCeff is still maintained in La1-xRxFe11.5Si1.5. In the present samples, a large δ Sm and a high RCeff have been achieved simultaneously.

关键词: magnetocaloric effect, hysteresis loss, refrigerant capacity

Abstract: Magnetic properties and magnetocaloric effects of La$_{1 - x}R_{x}$Fe$_{11.5}$Si$_{1.5}$ ($R$=Pr, ($0  \le  x \le  0.5$); $R$ = Ce and Nd, ($0  \le  x \le  0.3$)) compounds are investigated. Partially replacing La with $R$ =  Ce, Pr and Nd in La$_{1 - x}R_{x}$Fe$_{11.5}$Si$_{1.5}$ leads to a reduction in Curie temperature due to the lattice contraction. The substitution of $R$ for La causes an enhancement in field-induced itinerant electron metamagnetic transition, which leads to a remarkable increase in magnetic entropy change $\Delta S_{\rm m}$ and also in hysteresis loss. However, a high effective refrigerant capacity $RC_{\rm eff}$ is still maintained in  La$_{1 - x}R_{x}$Fe$_{11.5}$Si$_{1.5}$. In the present samples, a large $\Delta S_{\rm m}$ and a high $RC_{\rm eff}$ have been achieved simultaneously.

Key words: magnetocaloric effect, hysteresis loss, refrigerant capacity

中图分类号:  (Magnetocaloric effect, magnetic cooling)

  • 75.30.Sg
75.30.Kz (Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)) 75.60.Ej (Magnetization curves, hysteresis, Barkhausen and related effects)