Impact of W doping on Fe-rich (Mn,Fe)<sub>2</sub>(P,Si) based giant magnetocaloric materials

Journal article (2023)

Authors

F. Zhang RST/Fundamental Aspects of Materials and Energy - AS
Sebastian Smits Student
A. Kiecana RST/Fundamental Aspects of Materials and Energy - AS
I. Batashev RST/Fundamental Aspects of Materials and Energy - AS
Q. Shen RST/Fundamental Aspects of Materials and Energy - AS
N.H. van Dijk RST/Fundamental Aspects of Materials and Energy - AS
E.H. Brück RST/Fundamental Aspects of Materials and Energy - AS
Research Group
RST/Fundamental Aspects of Materials and Energy (AS) (TU Delft)
Copyright: © 2023 F. Zhang, Sebastian Smits, A. Kiecana, I. Batashev, Q. Shen, N.H. van Dijk, E.H. Brück
DOI
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https://doi.org/10.1016/j.jallcom.2022.167802
Magnetocaloric effect (Mn,Fe)(P,Si) Magnetic phase transition, low hysteresis W doping
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Published Date

2023

Language

English

Faculty

Applied Sciences

Department

RST/Radiation, Science and Technology

Research Group

RST/Fundamental Aspects of Materials and Energy

Abstract

The influence of doping with the 5d transition metal W has been studied in the quaternary (Mn,Fe)2(P,Si) based giant magnetocaloric compounds, which is one of the most promising systems for magnetic refrigeration. It is found that W substitution can separately decrease the Curie temperature TC and retain the thermal hysteresis ∆Thys at an almost constant level (∼5 K) for Mn0.6Fe1.27-xWxP0.64Si0.36 (x ≤ 0.02). Low-content W doping conserves the good magnetocaloric effect (MCE) without an obvious degradation. For x ≤ 0.02 the average magnetic entropy change |∆Sm| amounts to 11.4 Jkg−1K−1 for an applied magnetic field change of 2 T and the adiabatic temperature change ∆Tad amounts to 3.9 K for an applied magnetic field change of 1.5 T. The occupancy of substitutional W atoms is determined by XRD experiments and DFT calculations. Our studies provide a good strategy to further optimize the MCE of this material family.