Impact of fast-solidification on all-d-metal NiCoMnTi based giant magnetocaloric Heusler compounds

Journal article (2024)

Authors

F. Zhang RST/Fundamental Aspects of Materials and Energy - AS , City University of Hong Kong
Z. Wu RST/Fundamental Aspects of Materials and Energy - AS
Jianlin Wang Chinese Academy of Sciences
Zhenduo Wu City University of Hong Kong
C. Zhao RST/Storage of Electrochemical Energy - AS
S.W.H. Eijt RST/Fundamental Aspects of Materials and Energy - AS
H. Schut RST/Neutron and Positron Methods in Materials - AS
N.H. van Dijk RST/Fundamental Aspects of Materials and Energy - AS
E.H. Brück RST/Fundamental Aspects of Materials and Energy - AS
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Research Group
RST/Fundamental Aspects of Materials and Energy (AS) (TU Delft)
Copyright: © 2024 F. Zhang, Z. Wu, Jianlin Wang, Zhenduo Wu, C. Zhao, S.W.H. Eijt, H. Schut, N.H. van Dijk, E.H. Brück, More Authors
DOI
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https://doi.org/10.1016/j.actamat.2023.119595
Magnetocaloric effect All-d-metal Heusler compounds Lattice defects Ni-Co-Mn-Ti
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Published Date

2024

Language

English

Faculty

Applied Sciences

Department

RST/Radiation, Science and Technology

Research Group

RST/Fundamental Aspects of Materials and Energy

Abstract

Recently, the all-d-metal Ni(Co)MnTi based Heusler compounds are found to have a giant magnetocaloric effect (GMCE) near room temperature and manifest different functionalities like multicaloric effects, which can be employed for solid-state refrigeration. However, in comparison to other traditional Heusler compounds, the relatively large thermal hysteresis (ΔThys) and moderately steep ferromagnetic phase transition provides limitations for real applications. Here, we present that fast solidification (suction casting) can sufficiently tailor the GMCE performance by modifying the microstructure. Compared with the arc-melted sample, the magnetic entropy change of the suction-casted sample shows a 67% improvement from 18.4 to 29.4 Jkg−1K−1 for a field change (∆μ0H) of 5 T. As the thermal hysteresis has maintained a low ΔThys value (5.5 K) for the enhanced first-order phase transition, a very competitive reversible magnetic entropy change of 21.8 Jkg−1K−1 for ∆μ0H = 5 T is obtained. Combining high-resolution transmission electron microscopy (HRTEM) and positron annihilation spectroscopy (PAS) results, the difference in lattice defect concentration is found to be responsible for the significant improvement in GMCE for the suction-cast sample, which suggests that defect engineering can be applied to control the GMCE. Our study reveals that fast solidification can effectively regulate the magnetocaloric properties of all-d-metal NiCoMnTi Heusler compounds without sacrificing ΔThys.