Print Email Facebook Twitter Impact of fast-solidification on all-d-metal NiCoMnTi based giant magnetocaloric Heusler compounds Title Impact of fast-solidification on all-d-metal NiCoMnTi based giant magnetocaloric Heusler compounds Author Zhang, F. (TU Delft RST/Fundamental Aspects of Materials and Energy; City University of Hong Kong) Wu, Z. (TU Delft RST/Fundamental Aspects of Materials and Energy) Wang, Jianlin (Chinese Academy of Sciences) Wu, Zhenduo (City University of Hong Kong) Zhao, C. (TU Delft RST/Storage of Electrochemical Energy) Eijt, S.W.H. (TU Delft RST/Fundamental Aspects of Materials and Energy) Schut, H. (TU Delft RST/Neutron and Positron Methods in Materials) van Dijk, N.H. (TU Delft RST/Fundamental Aspects of Materials and Energy) Brück, E.H. (TU Delft RST/Fundamental Aspects of Materials and Energy) Date 2024 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. Subject All-d-metal Heusler compoundsLattice defectsMagnetocaloric effectNi-Co-Mn-Ti To reference this document use: http://resolver.tudelft.nl/uuid:4c4e19f9-87a1-435d-81bd-9ab5e43bea05 DOI https://doi.org/10.1016/j.actamat.2023.119595 ISSN 1359-6454 Source Acta Materialia, 265 Part of collection Institutional Repository Document type journal article Rights © 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 Files PDF 1_s2.0_S1359645423009230_main.pdf 9.79 MB Close viewer /islandora/object/uuid:4c4e19f9-87a1-435d-81bd-9ab5e43bea05/datastream/OBJ/view