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Colóquios 2015

Evento 

Título:
Design of thermoelectric highly efficient Heusler compounds by phase separation and nanocomposites
Quando:
15.10.2015 16.00 h
Onde:
Anfiteatro Antônio Cabral - Porto Alegre
Categoria:
Colóquios 2015

Descrição

Design of thermoelectric highly efficient Heusler compounds using phase separation and nano-composites

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 mid-temperature to 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.

I will give an overview about our recent investigations about phase separation in the thermoelectric Heusler compounds. I will present our studies on the phase separations in the quasi-ternary system TiNiSn-ZrNiSn-HfNiSn. Studying patents and publications of the last two years carefully, one could read a lot about not-single phase samples inside of the TiNiSn-ZrNiSn-HfNiSn system. Furthermore, I will show how we adapted this knowledge to design a p-type Heusler compound which led to a ZT increase of 130% compared to the best published bulk p-type Heusler compound in the literature.

Additionally, I will present how we used the knowledge about the phase separation to design thermoelectric highly efficient nano-composites of different single-phase materials.

 

These 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.

Local

Venue:
Anfiteatro Antônio Cabral
Cidade:
Porto Alegre
Estado:
Rio Grande do Sul
País:
País: br

Descrição

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Terça, Dezembro 07, 2021