Small hysteresis and giant magnetocaloric effect in Nb-substituted (Mn,Fe)2(P,Si) alloys
Shuyuan Hu (Nanjing University of Science and Technology)
Xuefei Miao (Nanjing University of Science and Technology)
Jun Liu (Nanjing University of Science and Technology, TU Delft - RST/Fundamental Aspects of Materials and Energy)
Zhiqiang Ou (Inner Mongolia Normal University China)
Mengqi Cong (Jiangsu University of Technology)
Oimod Haschuluu (Inner Mongolia Normal University China)
Yuanyuan Gong (Nanjing University of Science and Technology)
Fengjiao Qian (Nanjing University of Science and Technology, Nanjing, China)
Yurong You (Nanjing University of Science and Technology)
Yujing Zhang (Nanjing University of Science and Technology)
Feng Xu (Nanjing University of Science and Technology)
Ekkes Brück (TU Delft - RST/Fundamental Aspects of Materials and Energy)
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Abstract
The influence of Nb substitution on the structure, magnetoelastic transition and magnetocaloric properties has been investigated for the Mn1.1Fe0.85-xNbxP0.43Si0.57 alloys. The substitution for Fe by merely 4.7 at.% Nb (i.e. x = 0.04) significantly diminishes the thermal hysteresis from 10 to 1 K due to the reduced structural discontinuity crossing the magnetoelastic transition. This also improves the mechanical stability. The Curie temperature of the magnetoelastic transition is lowered by approximately 11.6 K per at.% of the Nb substitution, originating from the enhanced covalent bonding that favors the paramagnetic state. The giant magnetocaloric effect is still retained in the Nb-substituted alloys.
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