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Chin. Phys. B, 2015, Vol. 24(7): 077503    DOI: 10.1088/1674-1056/24/7/077503
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

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
Abstract  In the present work we reported the phase formation, microstructure, magnetocaloric effect and hydrogenation behavior of La-rich La1.7Fe11.6Si1.4 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 La1.7Fe11.6Si1.4 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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