4.6 Article

Microstructure and improved magnetocaloric properties: LaFeSi/LaAl magnets prepared by spark plasma sintering technique

Journal

JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 51, Issue 11, Pages -

Publisher

IOP PUBLISHING LTD
DOI: 10.1088/1361-6463/aaad28

Keywords

LaFeSi magnet; spark plasma sintering; LaAl alloy; magnetocaloric properties

Funding

  1. National Natural Science Foundation of China [51401103, 11304146, 51564037]
  2. Natural Science Foundation of Jiangxi Province [20161BAB206110]
  3. Jiangxi Provincial Graduate Student Innovation Special Funds Project [YC2016-S329]
  4. Jiangxi Provincial Education Department's Research Project [GJJ160713]

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Bulk LaFeSi magnets with the addition of LaAl alloy showing excellent performance were prepared by the spark plasma sintering (SPS) technique. The effects of heat treatment and various amounts of LaAl on the microstructure and magnetocaloric properties were investigated in details. It was found that appropriate amounts of LaAl can promote the peritectic reaction, and LaFeSi magnets with a high 1:13 phase amount can be obtained. Due to the unfavorable effects of Al in the peritectic reaction, excess addition of LaAl alloy was not beneficial to the formation of the 1:13 phase. The addition of 5 wt.% LaAl was most favorable to the formation of the 1:13 phase. Furthermore, heat treatment had important effects on the formation of the 1:13 phase and magnetocaloric performance. For SPSed LaFeSi magnets with 5 wt.% LaAl, the maximum values of magnetic entropy change (-Delta S-M)(max) and refrigerating capacity (RC) are 18.07 J. kg(-1). K-1 and 327.55 J. kg(-1) under the field changes of 0-5 L, respectively. The variation of Curie temperature (T-C) depended on the joint effects from the antiferromagnetic interaction between Fe-Al atoms and the ferromagnetic interaction between Fe-Fe atoms.

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