Synthesis of Y-doped n-type SrTiO3 thermoelectric oxides by polymerized complex process

Abstract

Synthesis of the Y-doped n-type SrTiO3 thermoelectric oxides was tried by the polymerized complex (PC) process and the subsequent hot pressing. The X-ray diffraction patterns of the Sr1-xYxTiO 3 powder precursors (O ≤ x ≤ 0.1) synthesized by the PC process showed that the perovskite SrTiO3 structure without any second phases was obtained, indicating that the Y-doped SrTiO3 powder can be fabricated by the PC process, which is a lower temperature process as compared to the conventional solid state reaction (SSR) process. It was found that the perovskite SrTiO3 structure mostly remained after the sintering by hot pressing. The Sr0.9Y0.1TiO3 sample showed the Seebeck coefficient and the electrical resistivity lower than those of the non-doped SrTiO3, supporting an increase in carrier concentration due to Y doping. The power factor of the Sr0.9Y0.1TiO 3 sintered compact was almost the same as that of the Sr 0.9Y0.1TiO3 prepared by the conventional SSR method. © 2008 The Japan Institute of Metals.