Tailoring of the electrical and thermal properties using ultra-short period non-symmetric superlattices
Source abstract
Abstract
Thermoelectric modules based on half-Heusler compounds offer a cheap and clean way to create eco-friendly electrical energy from waste heat. Here we study the impact of the period composition on the electrical and thermal properties in non-symmetric superlattices, where the ratio of components varies according to (TiNiSn)n:(HfNiSn)6−n, and 0 ⩽ n ⩽ 6 unit cells. The thermal conductivity (κ) showed a strong dependence on the material content achieving a minimum value for n = 3, whereas the highest value of the figure of merit ZT was achieved for n = 4. The measured κ can be well modeled using non-symmetric strain relaxation applied to the model of the series of thermal resistances.
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Research context
OpenAlex topics: Advanced Thermoelectric Materials and Devices · Heusler alloys: electronic and magnetic properties · Thermal properties of materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
University of Mainz 1 Institute of Physics, , Staudinger Weg 7, 55128 Mainz, Germany
Graduate School Materials Science in Mainz 2 , Staudinger Weg 9, 55128 Mainz, Germany
University of Mainz 3 Institute of Inorganic and Analytical Chemistry, , Duesbergweg 10-14, 55128 Mainz, Germany
University of Mainz 4 Institute for Physical Chemistry, , Welderweg 11, 55099 Mainz, Germany
Institute of Applied Geosciences 5 , TU Darmstadt, Schnittspahnstraße 9, 64287 Darmstadt, Germany
Max-Planck-Institute for Chemical Physics of Solids 6 , Nöthnitzer Straße 40, 01187 Dresden, Germany
Funding
Deutsche Forschungsgemeinschaft · Graduate School of Excellence Materials Science In Mainz
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