Impact of Ball Milling and High-Pressure Torsion on the Microstructure and Thermoelectric Properties of p- and n-type Sb-based Skutterudites
For thermoelectrics it is important to produce thermodynamically stable bulk nanostructured materials. Ball milling/hot pressing was shown to reduce the crystallite size by a factor of 100 and to reach about 100 nm with dislocation densities of 1012 -10l3m-2. Thereby thermoelectric properties of single, double and multifilled Sb-based skutterudites were improved significantly leading to figures of merit ZT, which in some cases are twice as high as those of their microstructured counterparts. With HPT treatment the crystallite size can be decreased to even 50 nm with dislocation densities as high as 1015m2. The small grains as well as the high dislocation density result in a further lowering of thermal conductivity holding a high potential for future enhancement of ZT.
Gerda Rogl Michael Zehetbauer Michael Kerber Peter Rogl Ernst Bauer
Physics of Nanostructured Materials,Univ.of Vienna,Boltzmanng.5,A-1090 Wien,Austria Institute of Solid State Physics,Vienna Univ.of Technology,Wiedner Hauptstrasse 8-10, A-1050 Wien,A
国际会议
5th International Conference on Nanomaterials by Severe Plastic Deformation(第五届剧烈塑性变形纳米材料国际会议)
南京
英文
1089-1094
2011-03-01（万方平台首次上网日期，不代表论文的发表时间）