Regensburg 2022 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 21: Transport in Materials: Thermal transport
MM 21.5: Vortrag
Mittwoch, 7. September 2022, 11:15–11:30, H45
Simultaneous measurement for the complete characterization of thermoelectric materials - real experiment and its digital twin — •Severin Kopatz1, Eckhard Müller1,2, and Pawel Ziolkowski1 — 1Institute of Materials Research, German Aerospace Center, Cologne, Germany — 2Institute of Inorganic and Analytical Chemistry, Justus Liebig University Gießen, Gießen, Germany
Thermoelectric (TE) materials directly convert thermal energy into electric energy. Their efficiency depends on the figure of merit zT (zT = S2σ/κ). Commonly, the individual transport properties, mainly the electrical conductivity (σ), the Seebeck coefficient (S), and the thermal conductivity (κ) are measured in separate measurement set-ups. Here, we report on the ’Combined ThermoElectric Measurement’ (CTEM) apparatus, which provides temperature-dependent measurements of the aforementioned transport properties on a single TE sample such as Co-doped FeSi2 simultaneously. The measurements are carried out in a temperature range between room temperature and 600 ∘C. Since experimental CTEM results deviate from reference values, we introduce a digital twin of the CTEM. In combination with the real experiment, the numerical model allows to study possible error sources. One of the examples discussed in this talk concerns radiative effects which have to be considered especially at high temperatures above 300 ∘C and affect the measurement of the thermal conductivity in particular.