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Table-like magnetocaloric effect and enhanced refrigerant capacity of HPS La(Fe,Si)13-based composites by Ce–Co grain boundary diffusion

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Abstract

The structure and magnetic properties of LaFe11.6Si1.4/Ce40Co60 bulk composites prepared by hot pressing sintering (HPS), followed by high-temperature diffusion annealing, were investigated. During the HPS process, the La(Fe,Si)13 alloy powder particles combined with Ce40Co60 binder and a porous structure with high mechanical strength were obtained. The addition of Ce40Co60 can also promote the peritectic reaction. Annealing has important effects on the magnetocaloric properties due to the diffusion of Ce and Co into the La(Fe,Si)13 phase during annealing. HPS samples were annealed at 1373 K for 24 h, and a table-like magnetocaloric effect, exhibiting a constant high magnetic entropy change (− ∆SM) of ~ 4.0 J/(kg K) in a commercially useful temperature region of 28 K (236–264 K), was obtained for a field change of 2 T. The values of full width at half maximum of (− ∆SM)–T plots (ΔTFWHM) and enhanced refrigeration capacity for the composites are 55 K and 173 J/kg, respectively, for a field change of 2 T. The composites exhibit high compressive strength of up to 312 MPa. The present results indicate that LaFe11.6Si1.4/Ce40Co60 bulk composites can meet the requirement of near room temperature magnetic refrigeration based on the Ericsson cycle.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant Nos. 51874143, 51671022, 51261001), the Natural Science Foundation of Guangdong Province (Grant Nos. 2019A1515010970, 2017A030313317), the National Key Research & Development Program of China (Materials Genome Initiative) (Grant No. 2017YFB0702703) and the Guangzhou Municipal Science and Technology Program (Grant No. 201904010030). This research is also conducted by Singapore-HUJ Alliance for Research and Enterprise (SHARE), Nanomaterials for Energy and Energy-Water Nexus (NEW), Campus for Research Excellence and Technological Enterprise (CREATE), Singapore 138602. Dr. Zhong Xichun also thanks the China Scholarship Council ([2017]3059, No. 201706155021) for financial support to visit Nanyang Technological University, Singapore.

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Authors and Affiliations

  1. School of Materials Science and Engineering, South China University of Technology, Guangzhou, 510640, China

    X. C. Zhong, X. T. Dong, D. R. Peng, D. L. Jiao, H. Zhang & Z. W. Liu

  2. Baotou Research Institute of Rare Earths, Baotou, 014030, China

    J. H. Huang

  3. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    H. Zhang

  4. School of Materials Science and Engineering, Nanyang Technological University, Singapore, 639798, Singapore

    R. V. Ramanujan

  5. Nanomaterials for Energy and Energy-Water Nexus (NEW), Campus for Research Excellence and Technological Enterprise (CREATE), Singapore-HUJ Alliance for Research and Enterprise (SHARE), Singapore, 138602, Singapore

    R. V. Ramanujan

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  1. X. C. Zhong
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Zhong, X.C., Dong, X.T., Peng, D.R. et al. Table-like magnetocaloric effect and enhanced refrigerant capacity of HPS La(Fe,Si)13-based composites by Ce–Co grain boundary diffusion. J Mater Sci 55, 5908–5919 (2020). https://doi.org/10.1007/s10853-020-04449-1

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