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      Permanent link:
      https://www.ias.ac.in/article/fulltext/boms/034/04/0825-0828

    • Keywords

       

      Magnetic entropy change (𝛥 𝑆M); adiabatic temperature change (𝛥 𝑇ad); heat treatment; microstructure.

    • Abstract

       

      The magnetocaloric effect of Gd5Si2Ge2 alloys under heat treatment conditions are investigated in low magnetic fields. The magnetocaloric effect (MCE) is studied by measuring magnetic entropy change (𝛥 𝑆M) and adiabatic temperature change (𝛥 𝑇ad) in a magnetic field of 1.5 T using a vibrating sample magnetometer (VSM) and a home-made magnetocaloric effect measuring apparatus, respectively. The maximum 𝛥 𝑆M of the alloys increases by 200% from 4.38 to 13.32 J kg-1 K-1, the maximum 𝛥 𝑇ad increases by 105% from 1.9 to 3.9 K when compared to the as-cast due to the homogeneous composition distribution and microstructure, while the magnetic ordering temperature is slightly reduced. These results indicate that the annealed Gd5Si2Ge2 compounds are promising as high-performance magnetic refrigerants working room temperature in relatively low magnetic fields.

    • Author Affiliations

       

      Hong Zeng1 Chunjiang Kuang1 Jiuxing Zhang2 Ming Yue2

      1. Advance Technology and Materials Co, Ltd, China Iron and Steel Research Institute Group, Beijing 100081, P.R. China
      2. The Key Laboratory of Advanced Functional Materials, Ministry of Education, Beijing University of Technology, Beijing 100022, P.R. China
    • Dates

       

© 2017 Indian Academy of Sciences, Bengaluru.