Synthesis of Y-Doped n-Type SrTiO<SUB>3</SUB> Thermoelectric Oxides by Polymerized Complex Process

Abstract

Synthesis of the Y-doped n-type SrTiO 3 thermoelectric oxides was tried by the polymerized complex (PC) process and the subsequent hot pressing. The X-ray diffraction patterns of the Sr 1Àx Y x TiO 3 powder precursors (0 x 0:1) synthesized by the PC process showed that the perovskite SrTiO 3 structure without any second phases was obtained, indicating that the Y-doped SrTiO 3 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 SrTiO 3 structure mostly remained after the sintering by hot pressing. The Sr 0:9 Y 0:1 TiO 3 sample showed the Seebeck coefficient and the electrical resistivity lower than those of the non-doped SrTiO 3 , supporting an increase in carrier concentration due to Y doping. The power factor of the Sr 0:9 Y 0:1 TiO 3 sintered compact was almost the same as that of the Sr 0:9 Y 0:1 TiO 3 prepared by the conventional SSR method.

Effects of yttrium substitution and oxygen deficiency on the crystal phase, microstructure, and thermoelectric properties of Sr1−1.5xYxTiO3−δ (0⩽x⩽0.15)

“…The reduction in lattice thermal conductivity is due to the phonon scattering through elastic strain field caused by the ionic radii mismatch [6]. The power factor of Sr 0.9 Y 0.1 TiO 3 shows no difference between the samples synthesized by polymerized complex method and conventional solid-state reaction method [7]. It has also been reported that the electrical conductivity of donor-doped SrTiO 3 is sensitive to Sr content and that the Srdeficient compositions have a much higher electrical conductivity than stoichiometric compositions [8][9][10].…”

Thermoelectric performance of Dy/Y co-doped SrTiO3 ceramic composites with submicron A2Ti2O7 (A = Dy, Y) pyrochlore

“…Many previous studies have shown that Y doping is an outstanding choice to enhance the thermoelectric performances for n-type SrTiO 3 ceramics, and the optimum doping concentration is about 10 mol% [29][30][31]. The atomic mass of the Dy element is larger, which is twice that of the Sr element, so when the Dy substitutes the Sr atom, it will lead to the enhancement of mass fluctuation scattering.…”

Effect of Addition of Titanium Nitride on Thermoelectric Performance of Yttrium-Doped Strontium Titanate

“…However, no n-type oxide thermoelectric material with sufficient performance has been developed yet. We have focused our attention to strontium titanate as a promising n-type thermoelectric oxide material [4][5][6][7][8] in this study. This material has a high ability of thermoelectric performance, but has a high thermal conductivity.…”