Dresden 2014 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 42: Thermoelectric Materials

DS 42.12: Vortrag

Donnerstag, 3. April 2014, 18:00–18:15, CHE 89

Phase separation as the key to thermoelectric highly efficient Heusler compounds — •Benjamin Balke — Institute of Inorganic and Analytical Chemistry, Johannes Gutenberg - University, Mainz, Germany

The Half-Heusler compounds are one of the most promising candidates among the high-temperature thermoelectric materials being investigated for automotive and industrial waste heat recovery applications. For n- as well as p-type materials ZT values with peak values larger than one have been published recently and first modules have been built. In this talk, we will give an overview about our recent investigations about phase separation in the thermoelectric Heusler compounds. We will present the most recent results on our studies on the phase separations in the quasi-ternary system TiNiSn-ZrNiSn-HfNiSn. Studying patents and publications the last two years carefully one could read a lot about not-single phase samples inside of the TiNiSn-ZrNiSn-HfNiSn system. Furthermore, we will show how we adapted this knowledge to design a p-type Heusler compound which led to a ZT increase of 50% compared to the best published bulk p-type Heusler compound in the literature. This results strongly underline the importance of phase separations as an important tool in the design of highly thermoelectric efficient materials which fulfill the industrial demands for a thermoelectric converter. In the end, I will briefly discuss the most recent development of thermoelectric modules using Heusler compounds.