naa a22 4500 510802702 CHVBK 20180411083402.0 cr unu---uuuuu 180411e20130701xx s 000 0 eng 10.1007/s11664-012-2357-2 doi (NATIONALLICENCE)springer-10.1007/s11664-012-2357-2 Lower Thermal Conductivity and Higher Thermoelectric Performance of Fe-Substituted and Ce, Yb Double-Filled p -Type Skutterudites [Elektronische Daten] [Sedat Ballikaya, Neslihan Uzar, Saffettin Yildirim, Hang Chi, Xianli Su, Gangjian Tan, Xinfeng Tang, Ctirad Uher] Substituting Fe on Co sites is an effective way to produce p-type skutterudite compounds as well as to reduce the thermal conductivity of skutterudites. In this work, we investigated thermoelectric properties of Fe-substituted and Ce+Yb double-filled Ce x Yb y Fe z Co4−z Sb12 (x=y=0.5, z=2.0 to 3.25 nominal) skutterudite compounds by studying the Seebeck coefficient, electrical conductivity, thermal conductivity, and Hall coefficient over a broad range of temperatures. All samples were prepared by using the traditional method of melting-annealing and spark plasma sintering. The signs of the Hall coefficient and Seebeck coefficient indicate that all samples are p-type conductors. Electrical conductivity increases with increasing Fe content. The temperature dependence of electrical conductivity indicates that a transition from the extrinsic to the intrinsic regime of conduction depends on the amount of Fe substituted for Co. The temperature dependence of mobility reflects the dominance of acoustic phonon scattering at temperatures above ambient. Except for Ce0.5Yb0.5Fe3.25Co0.75Sb12, the thermal conductivity increases with increasing Fe content, reaching the maximum value of 2.23W/mK at room temperature for Ce0.5Yb0.5Fe3CoSb12. A high power factor (27μW/K2cm) combined with a rather low thermal conductivity for Ce0.5Yb0.5Fe3.25Co0.75Sb12 (nominal) lead to a dimensionless figure of merit ZT=1.0 at 750K for this compound, one of the highest ZT values achieved in p-type skutterudite compounds prepared by the traditional method of melting-annealing and spark plasma sintering. TMS, 2012 Thermoelectric properties nationallicence p -type skutterudites nationallicence Ce, Yb double filled nationallicence thermal conductivity nationallicence Seebeck coefficient nationallicence Ballikaya Sedat Department of Physics, University of Istanbul, Vezneciler, 34134, Istanbul, Turkey aut Uzar Neslihan Department of Physics, University of Istanbul, Vezneciler, 34134, Istanbul, Turkey aut Yildirim Saffettin Department of Physics, University of Istanbul, Vezneciler, 34134, Istanbul, Turkey aut Chi Hang Department of Physics, University of Michigan, 48109, Ann Arbor, MI, USA aut Su Xianli State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 430070, Wuhan, China aut Tan Gangjian State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 430070, Wuhan, China aut Tang Xinfeng State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 430070, Wuhan, China aut Uher Ctirad Department of Physics, University of Michigan, 48109, Ann Arbor, MI, USA aut Journal of Electronic Materials Springer US; http://www.springer-ny.com 42/7(2013-07-01), 1622-1627 0361-5235 42:7<1622 2013 42 11664 https://doi.org/10.1007/s11664-012-2357-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11664-012-2357-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ballikaya Sedat Department of Physics, University of Istanbul, Vezneciler, 34134, Istanbul, Turkey aut NATIONALLICENCE 700 1- Uzar Neslihan Department of Physics, University of Istanbul, Vezneciler, 34134, Istanbul, Turkey aut NATIONALLICENCE 700 1- Yildirim Saffettin Department of Physics, University of Istanbul, Vezneciler, 34134, Istanbul, Turkey aut NATIONALLICENCE 700 1- Chi Hang Department of Physics, University of Michigan, 48109, Ann Arbor, MI, USA aut NATIONALLICENCE 700 1- Su Xianli State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 430070, Wuhan, China aut NATIONALLICENCE 700 1- Tan Gangjian State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 430070, Wuhan, China aut NATIONALLICENCE 700 1- Tang Xinfeng State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 430070, Wuhan, China aut NATIONALLICENCE 700 1- Uher Ctirad Department of Physics, University of Michigan, 48109, Ann Arbor, MI, USA aut NATIONALLICENCE 773 0- Journal of Electronic Materials Springer US; http://www.springer-ny.com 42/7(2013-07-01), 1622-1627 0361-5235 42:7<1622 2013 42 11664 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer