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The Effects of Ga Substitution on Magnetocaloric Effects of the R2Al1-xGax (R = Gd, Er) phases

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Abstract

Effects of Ga substitutions in R2Al1-xGax (R = Gd, Er) alloys have been studied. Gd2Al1-xGax (x ≤ 0.2) and Er2Al1-yGay (y ≤ 0.3) alloys are found to be crystallized in Co2Si-type orthorhombic structure. With increased Ga substitution for Al, the phase transition temperature is gradually increased. For the field change of 7 T, the maximum of entropy change (-ΔSM) is increased to 14.8 J/kgK and 11.2 J/kgK in Gd2Al0.8Ga0.2 and Er2Al0.7Ga0.3 alloys compared with 11.4 J/kgK and 8.3 J/kgK of Gd2Al and Er2Al alloys. And the relative cooling power is nearly doubled to 699.6 J/kg in Gd2Al0.8Ga0.2 alloy. As increasing Ga substitution, the critical magnetic field for the transition is decreased in Gd2Al1-xGax (x ≤ 0.2) alloys, and the magnetization is increased in Er2Al1-yGay (y ≤ 0.3) alloys. The considerable ΔSM implies that those materials are promising candidates for magnetic cooling.

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Funding

This work was supported by the National Natural Science Foundation of China (Grant No. 51971056); Fundamental Research Funds for the Central Universities (Grant Nos. N2009001, N2009002, N2002005, and N2109005); the open fundings of the State Key Laboratory of Solidification Processing in NWPU (Grant No. SKLSP201803), State Key Laboratory of Advanced Metals and Materials (Grant No.2019-ZD07), and State Key Laboratory for Mechanical Behavior of Materials (Grant No. 20202206); and the joint funding between Shenyang National Laboratory for Materials Science and State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals (Grant No. 18LHPY014) and Liaoning Revitalization Talent Program (Grant No. XLYC1907175).

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Authors and Affiliations

  1. Key Laboratory of Electromagnetic Processing of Materials, Northeastern University, Shenyang, 110819, China

    Guiquan Yao, He Chong, Shuai Li & Weibin Cui

  2. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang, 110819, China

    Qiang Wang

  3. State Key Laboratory of Advanced Metals and Materials, University of Science and Technology, Beijing, Beijing, 100083, China

    Jie Zhu

  4. State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710048, China

    Sen Yang

  5. State Key Laboratory of Transducer Technology (North Base), Institute of Electronics, CAS, Beijing, 100190, China

    Jiamin Chen

  6. Department of Physics and Chemistry of Materials, School of Material Science and Engineering, Northeastern University, Shenyang, 110819, China

    Weibin Cui

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  1. Guiquan Yao
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  2. He Chong
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  8. Weibin Cui
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Correspondence to Weibin Cui.

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Yao, G., Chong, H., Li, S. et al. The Effects of Ga Substitution on Magnetocaloric Effects of the R2Al1-xGax (R = Gd, Er) phases. J Supercond Nov Magn 34, 2977–2982 (2021). https://doi.org/10.1007/s10948-021-06015-5

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  • DOI: https://doi.org/10.1007/s10948-021-06015-5

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