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Effect of off-stoichiometry and Ta doping on Fe-rich (Mn,Fe)2(P,Si) based giant magnetocaloric materials

Journal Article (2023)
Author(s)

F. Zhang (TU Delft - RST/Fundamental Aspects of Materials and Energy)

I. Batashev (Radboud Universiteit Nijmegen, TU Delft - RST/Fundamental Aspects of Materials and Energy)

Niels Harmen H. Dijk (TU Delft - RST/Fundamental Aspects of Materials and Energy)

E. H. Brück (TU Delft - RST/Fundamental Aspects of Materials and Energy)

Research Group
RST/Fundamental Aspects of Materials and Energy
Copyright
© 2023 F. Zhang, I. Batashev, N.H. van Dijk, E.H. Brück
DOI related publication
https://doi.org/10.1016/j.scriptamat.2022.115253
More Info
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Publication Year
2023
Language
English
Copyright
© 2023 F. Zhang, I. Batashev, N.H. van Dijk, E.H. Brück
Research Group
RST/Fundamental Aspects of Materials and Energy
Volume number
226
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Abstract

The influence of off-stoichiometry and of doping with the 5d transition metal Ta has been studied in the quaternary (Mn,Fe)2(P,Si)-based compound, which is one of the most promising materials systems for magnetic refrigeration. It is found that Ta substitution can decrease the transition temperature Ttr, while the thermal hysteresis ∆Thys remains about constant. A low Ta doping enhances the magnetocaloric effect (MCE). For Mn0.6Fe1.27-yTayP0.64Si0.36 with y = 0.01 the magnetic entropy change ∆Sm shows and enhancement of 30.7% compared to the undoped material for a low magnetic field change of 1 T. The occupancy of substitutional Ta atoms is determined by XRD and DFT calculations. The Ttr shift and enhanced MCE upon Ta doping are ascribed to the competition between a weakening of the magnetic exchange interactions and a strengthening of the hybridization. Our studies provide a good strategy to further optimize the MCE of this material family.