Constraints on the Adiabatic Temperature Change in Magnetocaloric Materials

Kaspar Kirstein Nielsen, Christian Robert Haffenden Bahl, Anders Smith

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    Abstract

    The thermodynamics of the magnetocaloric effect implies constraints on the allowed variation in the adiabatic temperature change for a magnetocaloric material. An inequality for the derivative of the adiabatic temperature change with respect to temperature is derived for both first- and second-order materials. For materials with a continuous adiabatic temperature change as a function of temperature, this inequality is shown to hold for all temperatures. However, discontinuous materials may violate the inequality. We compare our results with measured results in the literature and discuss the implications of the result. Similar inequalities hold for barocaloric and electrocaloric materials.
    Original languageEnglish
    JournalPhysical Review B Condensed Matter
    Volume81
    Issue number5
    Pages (from-to)054423
    ISSN0163-1829
    DOIs
    Publication statusPublished - 2010

    Bibliographical note

    Copyright 2010 American Physical Society

    Keywords

    • Magnetic refrigeration
    • Fuel Cells and hydrogen
    • Magnetocaloric effect
    • Adiabatic temperature change

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