中国物理B ›› 2015, Vol. 24 ›› Issue (9): 97502-097502.doi: 10.1088/1674-1056/24/9/097502

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

Magnetic properties and magnetocaloric effects in Er1-xGdxCoAl intermetallic compounds

高新强a b, 莫兆军a b, 沈俊b, 李珂b, 戴巍b, 吴剑峰b, 唐成春a   

  1. a School of Material Science and Engineering, Hebei University of Technology, Tianjin 300384, China;
    b Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
  • 收稿日期:2014-10-16 修回日期:2015-04-05 出版日期:2015-09-05 发布日期:2015-09-05
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 51322605 and 51271192).

Magnetic properties and magnetocaloric effects in Er1-xGdxCoAl intermetallic compounds

Gao Xin-Qiang (高新强)a b, Mo Zhao-Jun (莫兆军)a b, Shen Jun (沈俊)b, Li Ke (李珂)b, Dai Wei (戴巍)b, Wu Jian-Feng (吴剑峰)b, Tang Cheng-Chun (唐成春)a   

  1. a School of Material Science and Engineering, Hebei University of Technology, Tianjin 300384, China;
    b Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
  • Received:2014-10-16 Revised:2015-04-05 Online:2015-09-05 Published:2015-09-05
  • Contact: Shen Jun, Tang Cheng-Chun E-mail:jshen@mail.ipc.ac.cn;tangcc@hebut.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 51322605 and 51271192).

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摘要： The magnetism and magnetocaloric effect in Er1-xGdxCoAl (x = 0, 0.1, 0.2, 0.4, 0.6, 0.8, 1) were investigated. The Er1-xGdxCoAl compounds were synthesized by arc melting. With the increasing Gd content, the Néel temperature (TN) linearly increases from 14 K to 102 K, while the magnetic entropy change (-Δ SM) tends to decrease nonmonotonously. Under the field change from 0 T to 5 T, the-Δ SM of the compounds with x = 0.2-1 are stable around 10 J/kg ·K, then a cooling platform between 20 K and 100 K can be formed by combining these compounds. For x = 0.6, 0.8, 1.0, the compounds undergo two successive magnetic transitions, one antiferromagnetism to ferromagnetism and the other ferromagnetism to paramagnetism, with increasing temperature. The two continuous magnetic transitions in this series are advantageous to broaden the temperature span of half-peak width (δ T) in the-Δ xM-T curve and improve the refrigeration capacity.

关键词: mgnetocaloric effect, magnetic entropy change, magnetic phase transformation

Abstract: The magnetism and magnetocaloric effect in Er1-xGdxCoAl (x = 0, 0.1, 0.2, 0.4, 0.6, 0.8, 1) were investigated. The Er1-xGdxCoAl compounds were synthesized by arc melting. With the increasing Gd content, the Néel temperature (TN) linearly increases from 14 K to 102 K, while the magnetic entropy change (-Δ SM) tends to decrease nonmonotonously. Under the field change from 0 T to 5 T, the-Δ SM of the compounds with x = 0.2-1 are stable around 10 J/kg ·K, then a cooling platform between 20 K and 100 K can be formed by combining these compounds. For x = 0.6, 0.8, 1.0, the compounds undergo two successive magnetic transitions, one antiferromagnetism to ferromagnetism and the other ferromagnetism to paramagnetism, with increasing temperature. The two continuous magnetic transitions in this series are advantageous to broaden the temperature span of half-peak width (δ T) in the-Δ xM-T curve and improve the refrigeration capacity.

Key words: mgnetocaloric effect, magnetic entropy change, magnetic phase transformation

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

  • 75.30.Sg
65.40.gd (Entropy) 75.30.Kz (Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.))