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HL: Fachverband Halbleiterphysik

HL 29: New materials

HL 29.1: Vortrag

Dienstag, 26. Februar 2008, 12:00–12:15, ER 164

Heusler compounds as thermoelectric materials — •Joachim Barth¹, Benjamin Balke¹, Fred Casper¹, Gerhard H. Fecher¹, Juergen Winterlik¹, Claudia Felser¹, Rosa Roberts², Andre Shkabko², and Anke Weidenkaff² — ¹Institute of Inorganic and Analytical Chemistry, Johannes Gutenberg - University, 55099 Mainz — ²Empa - Materials Science and Technology, Ueberlandstrasse 129, CH-8600 Duebendorf

Thermoelectric materials have gathered a lot of interest in the recent years. They can be either used in power generating devices or in heating and cooling systems. Several materials show interesting properties; among them are the Heusler and Half-Heusler compounds. These materialclasses are of special interest because they are very diverse and can be easily tuned to the needs of applications. To illustrate the diversity and tunability of these materials several compounds and the creating process are presented.
The process of finding promising materials includes three steps. At first we use band structure calculations to identify promising compounds. In the second step we synthesize them by arcmelting, which is followed by annealing. During the final step we characterize them by measuring XRD, electrical and thermal conductivity and Seebeckcoefficient. The quality of the compounds as thermoelectric materials is determined by the Power Factor and the Figure of merit.