Anomalous microstructure and magnetocaloric properties in off-stoichiometric La–Fe–Si and its hydride

doi:10.1088/1674-1056/24/7/077503

中国物理B ›› 2015, Vol. 24 ›› Issue (7): 77503-077503.doi: 10.1088/1674-1056/24/7/077503

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

Anomalous microstructure and magnetocaloric properties in off-stoichiometric La–Fe–Si and its hydride

何春^{a b c}, 张明晓^{a b}, 邵艳艳^{a b}, 董京杜^{a b}, 闫阿儒^{a b}, 刘剑^{a b}

a Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China;
b Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China;
c Nano Science and Technology Institute, University of Science and Technology of China, Hefei 230026, China

收稿日期:2014-11-20 修回日期:2015-01-28 出版日期:2015-07-05 发布日期:2015-07-05
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 51371184) and the Outstanding Youth Fund of Zhejiang Province, China (Grant No. LR14E010001).

Anomalous microstructure and magnetocaloric properties in off-stoichiometric La–Fe–Si and its hydride

He Chun (何春)^{a b c}, Zhang Ming-Xiao (张明晓)^{a b}, Shao Yan-Yan (邵艳艳)^{a b}, Dong Jing-Du (董京杜)^{a b}, Yan A-Ru (闫阿儒)^{a b}, Liu Jian (刘剑)^{a b}

a Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China;
b Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China;
c Nano Science and Technology Institute, University of Science and Technology of China, Hefei 230026, China

Received:2014-11-20 Revised:2015-01-28 Online:2015-07-05 Published:2015-07-05
Contact: Liu Jian E-mail:liujian@nimte.ac.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 51371184) and the Outstanding Youth Fund of Zhejiang Province, China (Grant No. LR14E010001).

摘要/Abstract

摘要： In the present work we reported the phase formation, microstructure, magnetocaloric effect and hydrogenation behavior of La-rich La_1.7Fe_11.6Si_1.4 alloy. In this off-stoichiometric La(Fe,Si)₁₃ alloy, the NaZn₁₃-type La(Fe,Si)₁₃ matrix phase shows faceted grains, with the Cr₅B₃-type La₅Si₃ used as the secondary phase distributed intergranularly. Such a peculiar morphology quickly forms upon one day annealing. In La_1.7Fe_11.6Si_1.4 alloy, we have observed a significant field dependence of magnetostructural transition temperature (～ 6.3 K/T), resulting in a large and table-like entropy change (ΔS～ 18 J/kg·K in 2 T) over a broad temperature range (～ 10 K). Upon hydrogenation, the maximum value of ΔS keeps almost unchanged, while the Curie temperature increases up to 350 K. These results indicate that the investigated off-stoichiometric La(Fe,Si)₁₃ alloy is a promising magnetic material for magnetic refrigerators.

关键词: La-Fe-Si alloys, Magnetocaloric effect, off-stoichiometric, magnetic refrigeration

Abstract: In the present work we reported the phase formation, microstructure, magnetocaloric effect and hydrogenation behavior of La-rich La_1.7Fe_11.6Si_1.4 alloy. In this off-stoichiometric La(Fe,Si)₁₃ alloy, the NaZn₁₃-type La(Fe,Si)₁₃ matrix phase shows faceted grains, with the Cr₅B₃-type La₅Si₃ used as the secondary phase distributed intergranularly. Such a peculiar morphology quickly forms upon one day annealing. In La_1.7Fe_11.6Si_1.4 alloy, we have observed a significant field dependence of magnetostructural transition temperature (～ 6.3 K/T), resulting in a large and table-like entropy change (ΔS～ 18 J/kg·K in 2 T) over a broad temperature range (～ 10 K). Upon hydrogenation, the maximum value of ΔS keeps almost unchanged, while the Curie temperature increases up to 350 K. These results indicate that the investigated off-stoichiometric La(Fe,Si)₁₃ alloy is a promising magnetic material for magnetic refrigerators.

Key words: La-Fe-Si alloys, Magnetocaloric effect, off-stoichiometric, magnetic refrigeration

中图分类号: (Intrinsic properties of magnetically ordered materials)

75.30.-m

75.50.-y (Studies of specific magnetic materials)

何春, 张明晓, 邵艳艳, 董京杜, 闫阿儒, 刘剑. Anomalous microstructure and magnetocaloric properties in off-stoichiometric La–Fe–Si and its hydride[J]. 中国物理B, 2015, 24(7): 77503-077503.

He Chun (何春), Zhang Ming-Xiao (张明晓), Shao Yan-Yan (邵艳艳), Dong Jing-Du (董京杜), Yan A-Ru (闫阿儒), Liu Jian (刘剑). Anomalous microstructure and magnetocaloric properties in off-stoichiometric La–Fe–Si and its hydride[J]. Chin. Phys. B, 2015, 24(7): 77503-077503.

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Anomalous microstructure and magnetocaloric properties in off-stoichiometric La–Fe–Si and its hydride

Anomalous microstructure and magnetocaloric properties in off-stoichiometric La–Fe–Si and its hydride

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