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 Sr_1−xY_xTiO₃ powder precursors (0≤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 Sr_0.9Y_0.1TiO₃ 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 Sr_0.9Y_0.1TiO₃ sintered compact was almost the same as that of the Sr_0.9Y_0.1TiO₃ prepared by the conventional SSR method.