Small hysteresis and giant magnetocaloric effect in Nb-substituted (Mn,Fe)2(P,Si) alloys

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 du...

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Bibliographic Details
Published in:Intermetallics 2019-11, Vol.114, p.106602, Article 106602
Main Authors: Hu, Shuyuan, Miao, Xuefei, Liu, Jun, Ou, Zhiqiang, Cong, Mengqi, Haschuluu, Oimod, Gong, Yuanyuan, Qian, Fengjiao, You, Yurong, Zhang, Yujing, Xu, Feng, Brück, Ekkes
Format: Article
Language:English
Subjects:
Curie temperature
Energy systems
Functional alloys
Hysteresis
Magnetic properties
Magnetism
Manganese
Materials substitution
Mechanical alloying and milling
Microstructure
Niobium
Phase transformation
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Summary: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. [Display omitted] •A small thermal hysteresis of 1 K was obtained in Nb-substituted Mn–Fe–P–Si alloys.•Giant magnetocaloric effect was retained in the Nb-substituted Mn–Fe–P–Si alloys.•Curie temperature can be effectively tuned by 11.6 K per at.% of Nb substitution.
ISSN:0966-9795
1879-0216
DOI:10.1016/j.intermet.2019.106602