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Zusammenfassung:
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 (kappa) 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 kappa can be well modeled using non-symmetric strain relaxation applied to the model of the series of thermal resistances. (C) 2016 Author(s).
