naa a22 4500 51080246X CHVBK 20180411083401.0 cr unu---uuuuu 180411e20130701xx s 000 0 eng 10.1007/s11664-013-2476-4 doi (NATIONALLICENCE)springer-10.1007/s11664-013-2476-4 Mechanical Alloying and Spark Plasma Sintering of Higher Manganese Silicides for Thermoelectric Applications [Elektronische Daten] [Yatir Sadia, Liron Dinnerman, Yaniv Gelbstein] The present challenges in the energy crisis require finding new ways to reduce consumption of fossil fuels. Thermoelectrics can help reduce fuel consumption by producing electricity from waste heat. The higher manganese silicides (HMS) have shown promise in this field as inexpensive, nontoxic, and highly stable p-type thermoelectric materials. One of the production techniques for HMS is mechanical alloying by ball milling. In this research the effect of the ball-milling duration and speed on the phases produced was studied. Mn and Si powders were milled at speeds of 200RPM to 800RPM for 1h to 7h. X-ray diffraction (XRD) results of the samples prepared using mechanical alloying show deterioration into the MnSi phase. The sample that underwent 5h of milling at 800RPM showed the greatest amount of HMS phase and was subsequently spark plasma sintered. The sample showed insufficient thermoelectric properties (ZT≈0.1 at 450°C), compared with either solid-state reaction samples showing ZT≈0.4 or cast samples showing ZT≈0.63 at 450°C. The reduced ZT values of the mechanically alloyed and spark-plasma-sintered samples were attributed to the high relative amount of MnSi phase. The correlation between the relative amount of MnSi and the transport properties is described in detail. TMS, 2013 Higher manganese silicides nationallicence thermoelectric nationallicence mechanical alloying nationallicence spark plasma sintering nationallicence Sadia Yatir Department of Materials Engineering, Ben-Gurion University of the Negev, Beer Sheva, Israel aut Dinnerman Liron Department of Materials Engineering, Ben-Gurion University of the Negev, Beer Sheva, Israel aut Gelbstein Yaniv Department of Materials Engineering, Ben-Gurion University of the Negev, Beer Sheva, Israel aut Journal of Electronic Materials Springer US; http://www.springer-ny.com 42/7(2013-07-01), 1926-1931 0361-5235 42:7<1926 2013 42 11664 https://doi.org/10.1007/s11664-013-2476-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11664-013-2476-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Sadia Yatir Department of Materials Engineering, Ben-Gurion University of the Negev, Beer Sheva, Israel aut NATIONALLICENCE 700 1- Dinnerman Liron Department of Materials Engineering, Ben-Gurion University of the Negev, Beer Sheva, Israel aut NATIONALLICENCE 700 1- Gelbstein Yaniv Department of Materials Engineering, Ben-Gurion University of the Negev, Beer Sheva, Israel aut NATIONALLICENCE 773 0- Journal of Electronic Materials Springer US; http://www.springer-ny.com 42/7(2013-07-01), 1926-1931 0361-5235 42:7<1926 2013 42 11664 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer