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Magnetostructural transformation and magnetocaloric effect of Sn-bonded Mn0.66Fe0.34Ni0.66Fe0.34Si0.66Ge0.34 composite.

ABSTRACT: Magnetostructural coupling in MnMX (M = Co or Ni, X = Si or Ge) system attracts considerable attention for the accompanied multi-magnetoresponsive effects. However, due to the large stress generated from the structural transformation, the alloys become shattered or powder-like, hindering the further investigation and their applications. The possible solution is to embed the MnMX powders into metal matrix. In this paper, we choose Mn0.66Fe0.34Ni0.66Fe0.34Si0.66Ge0.34 as a representative of MnMX alloy and produce Mn0.66Fe0.34Ni0.66Fe0.34Si0.66Ge0.34/Sn composite bulk by hot pressing. The magnetostructural-coupled composites exhibit an improved rate of the transformation temperature shift by magnetic field and broadened operating temperature range. Additionally, we also propose a simple formula based on the entropy-temperature diagram to calculate the isothermal entropy change, which is consistent with the results obtained by the Maxwell relation.

SUBMITTER: Si Y 

PROVIDER: S-EPMC5758529 | biostudies-literature | 2018 Jan

REPOSITORIES: biostudies-literature

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Magnetostructural transformation and magnetocaloric effect of Sn-bonded Mn<sub>0.66</sub>Fe<sub>0.34</sub>Ni<sub>0.66</sub>Fe<sub>0.34</sub>Si<sub>0.66</sub>Ge<sub>0.34</sub> composite.

Si Yu Y   Liu Jun J   Gong Yuan-Yuan YY   Yuan Sheng-Yun SY   Peng Guo G   Xu Gui-Zhou GZ   Xu Feng F  

Scientific reports 20180108 1

Magnetostructural coupling in MnMX (M = Co or Ni, X = Si or Ge) system attracts considerable attention for the accompanied multi-magnetoresponsive effects. However, due to the large stress generated from the structural transformation, the alloys become shattered or powder-like, hindering the further investigation and their applications. The possible solution is to embed the MnMX powders into metal matrix. In this paper, we choose Mn<sub>0.66</sub>Fe<sub>0.34</sub>Ni<sub>0.66</sub>Fe<sub>0.34</su  ...[more]

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