题目: Development of high ZT skutterudites for thermoelectric applications
报告人: G. Rogl
时间: 5月4日（周五），上午9：00
地点：师昌绪楼403会议室
Development of high ZT skutterudites for thermoelectric applications
G. Rogl1,2,3,4
1Christian Doppler Laboratory for Thermoelectrics, Vienna,Austria
2Institute of Physical Chemistry, University of Vienna, Währingerstrasse 42, A-1090 Wien
3Institute of Solid State Physics, TU-Wien, Wiedner Hauptstrasse, 8-10, A-1040 Wien, Austria
4Physics of Nanostructured Materials, University of Vienna, Boltzmanngasse 5, A-1090 Wien, Austria
Filled skutterudites are among the best candidates for thermoelectric (TE) applications, particularly in automotives, because they cover the temperature range needed for TE devices, the starting material is cheap and abundant and they can be produced easily and fast. The highest ZT values for both p- and n-type skutterudites have been renewed continuously, recently reaching ZT = 1.3 for double or multifilled p-type and ZT = 1.8 for multi filled n-type skutterudites. The development of the design and preparation of high ZT p-and n-type skutterudites and their stability will be discussed and it will be shown how these high values could be increased after severe plastic deformation (SPD) via high pressure torsion (HPT) to ZT > 1.4 and ZT > 1.9, respectively.
Thermal expansions of the material as well as mechanical properties play an important role; their values should be as similar as possible for p- and n-type alloys to avoid stresses when used in a TE device under cyclic temperature gradients. Therefore, an overview will be presented on mechanical property data available in the literature including all results of our investigations.
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