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

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

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.

Keywords: La-Fe-Si alloys Magnetocaloric effect off-stoichiometric magnetic refrigeration

Received: 20 November 2014
Revised: 28 January 2015
Accepted manuscript online:

PACS:	75.30.-m	(Intrinsic properties of magnetically ordered materials)
	75.50.-y	(Studies of specific magnetic materials)

Fund: 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).

Corresponding Authors: Liu Jian
E-mail: liujian@nimte.ac.cn

Cite this article:

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 2015 Chin. Phys. B 24 077503

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

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