naa a22 4500 510802818 CHVBK 20180411083403.0 cr unu---uuuuu 180411e20130701xx s 000 0 eng 10.1007/s11664-012-2284-2 doi (NATIONALLICENCE)springer-10.1007/s11664-012-2284-2 p -Type Bismuth Telluride-Based Composite Thermoelectric Materials Produced by Mechanical Alloying and Hot Extrusion [Elektronische Daten] [M. Keshavarz, D. Vasilevskiy, R.A. Masut, S. Turenne] We produced six different composites of p-type bismuth antimony telluride alloys and studied their structure and thermoelectric properties. The components of the composites were obtained in powder form by mechanical alloying. Mixed powders of two different compositions were consolidated by hot extrusion to obtain each bulk composite. The minimum grain size of bulk composites as revealed by scanning electron microscopy shows a 50% reduction compared with the conventional (Bi0.2Sb0.8)2Te3. X-ray diffraction (XRD) analysis only shows peak broadening with no clear indication of separate phases, and indicates a systematic decrease of crystallite size in the composite materials. Scattering mechanisms of charge carriers were evaluated by Hall-effect measurements. The thermoelectric properties were investigated via the Harman method from 300K up to 460K. The composites show no significant degradation of the power factor and high peak ZT values ranging from 0.86 to 1.04. The thermal conductivity of the composites slightly increases with respect to the conventional alloy. This unexpected behavior can be attributed to two factors: (1) the composites do not yet contain a significant number of grains whose sizes are sufficiently small to increase phonon scattering, and (2) each of the combined components of the composites corresponds to a phase with thermal conductivity higher than the minimum value corresponding to the (Bi0.2Sb0.8)2Te3 alloy. TMS, 2012 Composite thermoelectrics nationallicence bismuth telluride nationallicence hot extrusion nationallicence mechanical alloying nationallicence Keshavarz M. École Polytechnique de MontrÉal, C.P. 6079, Succ. Centre-Ville, H3C 3A7, Montreal, QC, Canada aut Vasilevskiy D. École Polytechnique de MontrÉal, C.P. 6079, Succ. Centre-Ville, H3C 3A7, Montreal, QC, Canada aut Masut R.A. École Polytechnique de MontrÉal, C.P. 6079, Succ. Centre-Ville, H3C 3A7, Montreal, QC, Canada aut Turenne S. École Polytechnique de MontrÉal, C.P. 6079, Succ. Centre-Ville, H3C 3A7, Montreal, QC, Canada aut Journal of Electronic Materials Springer US; http://www.springer-ny.com 42/7(2013-07-01), 1429-1435 0361-5235 42:7<1429 2013 42 11664 https://doi.org/10.1007/s11664-012-2284-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11664-012-2284-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Keshavarz M. École Polytechnique de MontrÉal, C.P. 6079, Succ. Centre-Ville, H3C 3A7, Montreal, QC, Canada aut NATIONALLICENCE 700 1- Vasilevskiy D. École Polytechnique de MontrÉal, C.P. 6079, Succ. Centre-Ville, H3C 3A7, Montreal, QC, Canada aut NATIONALLICENCE 700 1- Masut R.A. École Polytechnique de MontrÉal, C.P. 6079, Succ. Centre-Ville, H3C 3A7, Montreal, QC, Canada aut NATIONALLICENCE 700 1- Turenne S. École Polytechnique de MontrÉal, C.P. 6079, Succ. Centre-Ville, H3C 3A7, Montreal, QC, Canada aut NATIONALLICENCE 773 0- Journal of Electronic Materials Springer US; http://www.springer-ny.com 42/7(2013-07-01), 1429-1435 0361-5235 42:7<1429 2013 42 11664 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer