Dependence of thermoelectric behaviour on severe plastic deformation parameters: A case study on p-type skutterudite DD0.60Fe3CoSb12 |
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| Authors: | Gerda Rogl Andriy Grytsiv Peter Rogl Esmaeil Royanian Ernst Bauer Jelena Horky Daria Setman Erhard Schafler Michael Zehetbauer |
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| Affiliation: | 1. Institute of Physical Chemistry, University of Vienna, Währingerstrasse 42, A-1090 Wien, Austria;2. Institute of Solid State Physics, Vienna University of Technology, Wiedner Hauptstrasse 8-10, A-1040 Wien, Austria;3. Research Group Physics of Nanostructured Materials, University of Vienna, Boltzmanngasse 5, A-1090 Wien, Austria |
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| Abstract: | High-pressure torsion (HPT), a severe plastic deformation technique, can effectively improve the thermoelectric performance of skutterudites, resulting in ZT values higher than for ball-milled and hot-pressed (BMHP) samples. In this paper the influence of the HPT parameters, i.e. the number of revolutions (equivalent to the applied strain), the processing temperature and the hydrostatic pressure on the microstructural and thermoelectric properties of the skutterudite DD0.60Fe3CoSb12 are evaluated and compared with the BMHP samples before HPT processing. Whilst the three parameters have specific effects on (i) the crystallite size, (ii) the density of lattice defects and (ii) the density of cracks, a suitable combination thereof allows for an increase of the figure of merit by at least 20%. |
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| Keywords: | Skutterudite Severe plastic deformation High pressure torsion Nanostructures |
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