Regensburg 2010 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 47: New Materials: mainly thermoelectric and nanomechanical Properties
HL 47.2: Vortrag
Mittwoch, 24. März 2010, 16:15–16:30, H14
Type-I clathrate compounds as thermoelectric materials — •Christophe Candolfi, Umut Aydemir, Niels Oeschler, Michael Baitinger, Yuri Grin, and Frank Steglich — Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Str. 40, 01187 Dresden, Germany
In the last decade, huge efforts were devoted to improve the thermoelectric properties of intermetallic clathrates. Their crystal structures are composed of face-condensed polyhedral cages in which metal cations are situated. Cage compounds represent a promising class of material for thermoelectric applications at high temperatures since they usually feature a low thermal conductivity and chemical stability up to 900 K. By changing the chemical composition, the charge carrier concentration can be tuned with the aim at achieving high thermoelectric figure of merits. Here, we present and discuss how this can be realized in some type-I clathrates in the system Ba8MxGe46−y (where M is a transition metal) both in the high and low temperature ranges (2 - 700 K).