Indirect measurement of the magnetocaloric effect using a novel differential scanning calorimeter with magnetic field

Stinus Jeppesen, Søren Linderoth, Nini Pryds, Luise Theil Kuhn, Jesper Buch Jensen

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    Abstract

    A simple and high-sensitivity differential scanning calorimeter (DSC) unit operating under magnetic field has been built for indirect determination of the magnetocaloric effect. The principle of the measuring unit in the calorimeter is based on Peltier elements as heat flow sensors. The high sensitivity of the apparatus combined with a suitable calibration procedure allows very fast and accurate heat capacity measurements under magnetic field to be made. The device was validated from heat capacity measurements for the typical DSC reference material gallium (Ga) and a La0.67Ca0.33MnO3 manganite system and the results were highly consistent with previous reported data for these materials. The DSC has a working range from 200 to 340 K and has been tested in magnetic fields reaching 1.8 T. The signal-to-noise ratio is in the range of 102–103 for the described experiments. Finally the results have been compared to results from a Quantum Design® physical properties measuring system. The configuration of the system also has the advantage of being able to operate with other types of magnets, e.g., permanent magnets or superconducting coils, as well as the ability to be expanded to a wider temperature range. ©2008 American Institute of Physics
    Original languageEnglish
    JournalReview of Scientific Instruments
    Volume79
    Issue number8
    Pages (from-to)083901
    ISSN0034-6748
    DOIs
    Publication statusPublished - 2008

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    Copyright (2008) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.

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