naa a22 4500 510801544 CHVBK 20180411083357.0 cr unu---uuuuu 180411e20130701xx s 000 0 eng 10.1007/s11664-013-2581-4 doi (NATIONALLICENCE)springer-10.1007/s11664-013-2581-4 Fabrication of Titanium Oxide-Based Composites by Reactive SPS Sintering and Their Thermoelectric Properties [Elektronische Daten] [K. Fuda, T. Shoji, S. Kikuchi, Y. Kunihiro, S. Sugiyama] Titanium oxide-based composites containing (1) Nb, (2) Nb and Sr, and (3) Sr and La were fabricated by a combination of wet processing and reactive spark plasma sintering in which the metal oxide components were reduced by reaction with titanium nitride. If only TiO2 was used as the starting material, several Magneli-type phases of oxygen-deficient titanium oxides were obtained. When mixed with Nb ions with Ti:Nb=0.9:0.1, microsegregation of Nb ions was observed (case1). If Sr was added, a perovskite, SrTiO3 (STO) phase occurred (case2), which contained La ions in the case of La addition (case3). The sintered compacts consisted largely of grains of about 1μm in size. In the case of Ti-Nb combination (case1), a unique stripe pattern also appeared inside the grains. The electrical conductivity increased monotonically with increasing temperature in the case of the pure Magneli phases and the Nb-containing composite, whereas bow-shaped temperature dependences with a maximum were observed in the case of the composites containing STO phases. The Seebeck coefficients were commonly negative, and the absolute values increased with temperature. The thermal conductivity was between 2Wm−1K−1 and 4Wm−1K−1 in the temperature range from room temperature to 800°C. A maximum ZT of 0.34 was achieved at 800°C (case2). TMS, 2013 Titanium oxide nationallicence thermoelectric nationallicence SPS sintering nationallicence microtexture nationallicence Fuda K. Department of Applied Chemistry, Akita University, 010-8502, Akita, Japan aut Shoji T. Department of Applied Chemistry, Akita University, 010-8502, Akita, Japan aut Kikuchi S. Department of Applied Chemistry, Akita University, 010-8502, Akita, Japan aut Kunihiro Y. Akita Prefectural Industrial Technology Center, 010-1623, Akita, Japan aut Sugiyama S. Akita Prefectural Industrial Technology Center, 010-1623, Akita, Japan aut Journal of Electronic Materials Springer US; http://www.springer-ny.com 42/7(2013-07-01), 2209-2213 0361-5235 42:7<2209 2013 42 11664 https://doi.org/10.1007/s11664-013-2581-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11664-013-2581-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Fuda K. Department of Applied Chemistry, Akita University, 010-8502, Akita, Japan aut NATIONALLICENCE 700 1- Shoji T. Department of Applied Chemistry, Akita University, 010-8502, Akita, Japan aut NATIONALLICENCE 700 1- Kikuchi S. Department of Applied Chemistry, Akita University, 010-8502, Akita, Japan aut NATIONALLICENCE 700 1- Kunihiro Y. Akita Prefectural Industrial Technology Center, 010-1623, Akita, Japan aut NATIONALLICENCE 700 1- Sugiyama S. Akita Prefectural Industrial Technology Center, 010-1623, Akita, Japan aut NATIONALLICENCE 773 0- Journal of Electronic Materials Springer US; http://www.springer-ny.com 42/7(2013-07-01), 2209-2213 0361-5235 42:7<2209 2013 42 11664 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer