Magnetocaloric properties of LaFe13−x−yCoxSiy and commercial grade Gd

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    Abstract

    The magnetocaloric properties of three samples of LaFe13−x−yCoxSiy have been measured and compared to measurements of commercial grade Gd. The samples have (x=0.86, y=1.08), (x=0.94, y=1.01) and (x=0.97, y=1.07) yielding Curie temperatures in the range 276–288 K. The magnetization, specific heat capacity and adiabatic temperature change have been measured over a broad temperature interval. Importantly, all measurements were corrected for demagnetization, allowing the data to be directly compared. In an internal field of 1 T the maximum specific entropy changes were 6.2, 5.1 and 5.0 J/kg K, the specific heat capacities were 910, 840 and 835 J/kg K and the adiabatic temperature changes were 2.3, 2.1 and 2.1 K for the three LaFeCoSi samples respectively. For Gd in an internal field of 1 T the maximum specific entropy change was 3.1 J/kg K, the specific heat capacity was 340 J/kg K and the adiabatic temperature change was 3.3 K. The adiabatic temperature change was also calculated from the measured values of the specific heat capacity and specific magnetization and compared to the directly measured values. In general an excellent agreement was seen.
    Original languageEnglish
    JournalJournal of Magnetism and Magnetic Materials
    Volume322
    Issue number24
    Pages (from-to)3882-3888
    ISSN0304-8853
    DOIs
    Publication statusPublished - 2010

    Keywords

    • Magnetic refrigeration
    • Fuel Cells and Hydrogen

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