naa a22 4500 510802974 CHVBK 20180411083403.0 cr unu---uuuuu 180411e20130701xx s 000 0 eng 10.1007/s11664-012-2413-y doi (NATIONALLICENCE)springer-10.1007/s11664-012-2413-y In Situ Preparation and Thermoelectric Properties of B4C1− x -TiB2 Composites [Elektronische Daten] [Bing Feng, Hans-Peter Martin, Alexander Michaelis] B4C1−x -TiB2 composites were prepared by insitu reactive spark plasma sintering of B4C with addition of nano-TiO2 powder. The effect of TiO2 addition on the sinterability of boron carbide was studied. The composition and the microstructure of the dense composites are characterized by means of x-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive x-ray spectroscopy (EDX). The studies show that the composites contain boron carbide and TiB2 phases with a homogeneous structure. In addition, the correlation between the composition and the thermoelectric properties was investigated. The electrical conductivity of the composite increased with increasing addition of TiO2, and the Seebeck coefficient decreased with TiO2 addition. The percolation threshold ø c for TiB2 in the B4C1−x -TiB2 system was found to be in the range of 0.139 to 0.189. The thermal conductivity was reduced in the whole measuring temperature range from 50°C to 800°C below ø c. Accordingly, a significant enhancement in the dimensionless figure of merit ZT of the composites was achieved compared with that of boron carbide without TiO2 addition, with ZT achieving its maximum value at 10wt.% TiO2. TMS, 2013 Boron carbide nationallicence titanium dioxide nationallicence titanium diboride nationallicence composite nationallicence thermoelectric properties nationallicence Feng Bing Institute for Materials Science, Dresden University of Technology, TU Dresden, Dresden, Germany aut Martin Hans-Peter Fraunhofer Institute for Ceramic Technologies and Systems, Dresden, Germany aut Michaelis Alexander Institute for Materials Science, Dresden University of Technology, TU Dresden, Dresden, Germany aut Journal of Electronic Materials Springer US; http://www.springer-ny.com 42/7(2013-07-01), 2314-2319 0361-5235 42:7<2314 2013 42 11664 https://doi.org/10.1007/s11664-012-2413-y text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11664-012-2413-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Feng Bing Institute for Materials Science, Dresden University of Technology, TU Dresden, Dresden, Germany aut NATIONALLICENCE 700 1- Martin Hans-Peter Fraunhofer Institute for Ceramic Technologies and Systems, Dresden, Germany aut NATIONALLICENCE 700 1- Michaelis Alexander Institute for Materials Science, Dresden University of Technology, TU Dresden, Dresden, Germany aut NATIONALLICENCE 773 0- Journal of Electronic Materials Springer US; http://www.springer-ny.com 42/7(2013-07-01), 2314-2319 0361-5235 42:7<2314 2013 42 11664 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer