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MM: Fachverband Metall- und Materialphysik

MM 16: Transport - Heat Transport and Thermoelectricity

MM 16.1: Vortrag

Montag, 16. März 2020, 17:00–17:15, IFW A

Specific heat capacity measurements and transmission electron microscopy investigation of FeMn alloys — •Marius Gerlitz, Martin Peterlechner, Sergiy Divinski, and Gerhard Wilde — Westfälische Wilhelms-Universität, Münster, Deutschland

Magnetocaloric materials are promising for various fields of application and their thermodynamic fundamentals are crucial to understand. In this work, low temperature specific heat capacity measurements are performed for a series of Fe-Mn alloys with and without application of a magnetic field (up to 9T) in the temperature interval from 4 K to 400 K. A physical properties measurement system (PPMS) is used and the 2-tau method is applied for the analysis. Furthermore, the heat capacity measurements are extended to higher temperatures from 300 K to 723 K using differential scanning calorimetry and applying heating rates of 20 K/min. As a result, thermal and magnetic entropy contributions are determined alongside with the determination of further characteristic properties such as the Debye temperature or the electronic contribution to the specific heat. A microstructural analysis is performed by transmission electron microscopy (TEM). The results are discussed with respect to the chemical composition and potential short-range ordering.