naa a22 4500 510802133 CHVBK 20180411083400.0 cr unu---uuuuu 180411e20130701xx s 000 0 eng 10.1007/s11664-012-2440-8 doi (NATIONALLICENCE)springer-10.1007/s11664-012-2440-8 High-Pressure Torsion to Improve Thermoelectric Efficiency of Clathrates? [Elektronische Daten] [X. Yan, M. Falmbigl, G. Rogl, A. Grytsiv, A. Prokofiev, E. Bauer, P. Rogl, M. Zehetbauer, S. Paschen] High-pressure torsion (HPT), as a technique to produce severe plastic deformation, has been proven effective to improve the thermoelectric performance of skutterudites. In this report, we present microstructural and thermoelectric properties of the clathrate Ba8Cu3.5Ge41In1.5 processed by HPT. The sample was synthesized from high-purity elements, subsequently annealed, ball milled, and hot pressed, and finally subject to HPT. Compared with the ball-milled and hot-pressed sample, the HPT-processed sample has higher electrical resistivity and Seebeck coefficient, and lower thermal conductivity, electron concentration, and mobility, which is attributed to the reduced grain size and increased density of dislocations, point defects, and cracks. No essential improvement of the dimensionless thermoelectric figure of merit is observed in the investigated temperature range, questioning the universal versatility of this technique for improvement of thermoelectric materials. TMS, 2013 Thermoelectric materials nationallicence clathrates nationallicence high-pressure torsion nationallicence thermoelectric and transport measurements nationallicence Yan X. Institute of Solid State Physics, Vienna University of Technology, Wiedner Hauptstr. 8-10, 1040, Vienna, Austria aut Falmbigl M. Institute of Physical Chemistry, Vienna University, Währingerstr. 42, 1090, Vienna, Austria aut Rogl G. Institute of Physical Chemistry, Vienna University, Währingerstr. 42, 1090, Vienna, Austria aut Grytsiv A. Institute of Physical Chemistry, Vienna University, Währingerstr. 42, 1090, Vienna, Austria aut Prokofiev A. Institute of Solid State Physics, Vienna University of Technology, Wiedner Hauptstr. 8-10, 1040, Vienna, Austria aut Bauer E. Institute of Solid State Physics, Vienna University of Technology, Wiedner Hauptstr. 8-10, 1040, Vienna, Austria aut Rogl P. Institute of Physical Chemistry, Vienna University, Währingerstr. 42, 1090, Vienna, Austria aut Zehetbauer M. Research Group Physics of Nanostructured Materials, Vienna University, Boltzmanngasse 5, 1090, Vienna, Austria aut Paschen S. Institute of Solid State Physics, Vienna University of Technology, Wiedner Hauptstr. 8-10, 1040, Vienna, Austria aut Journal of Electronic Materials Springer US; http://www.springer-ny.com 42/7(2013-07-01), 1330-1334 0361-5235 42:7<1330 2013 42 11664 https://doi.org/10.1007/s11664-012-2440-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11664-012-2440-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Yan X. Institute of Solid State Physics, Vienna University of Technology, Wiedner Hauptstr. 8-10, 1040, Vienna, Austria aut NATIONALLICENCE 700 1- Falmbigl M. Institute of Physical Chemistry, Vienna University, Währingerstr. 42, 1090, Vienna, Austria aut NATIONALLICENCE 700 1- Rogl G. Institute of Physical Chemistry, Vienna University, Währingerstr. 42, 1090, Vienna, Austria aut NATIONALLICENCE 700 1- Grytsiv A. Institute of Physical Chemistry, Vienna University, Währingerstr. 42, 1090, Vienna, Austria aut NATIONALLICENCE 700 1- Prokofiev A. Institute of Solid State Physics, Vienna University of Technology, Wiedner Hauptstr. 8-10, 1040, Vienna, Austria aut NATIONALLICENCE 700 1- Bauer E. Institute of Solid State Physics, Vienna University of Technology, Wiedner Hauptstr. 8-10, 1040, Vienna, Austria aut NATIONALLICENCE 700 1- Rogl P. Institute of Physical Chemistry, Vienna University, Währingerstr. 42, 1090, Vienna, Austria aut NATIONALLICENCE 700 1- Zehetbauer M. Research Group Physics of Nanostructured Materials, Vienna University, Boltzmanngasse 5, 1090, Vienna, Austria aut NATIONALLICENCE 700 1- Paschen S. Institute of Solid State Physics, Vienna University of Technology, Wiedner Hauptstr. 8-10, 1040, Vienna, Austria aut NATIONALLICENCE 773 0- Journal of Electronic Materials Springer US; http://www.springer-ny.com 42/7(2013-07-01), 1330-1334 0361-5235 42:7<1330 2013 42 11664 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer