錯体重合法およびパルス通電焼結法を利用したSrTiO_3系熱電変換材料の合成

概要

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The establishment of rapid synthesis process at a low temperature of thermoelectric SrTiO3 was tried by using the polymerized complex (PC) process and the pulsed current heating (PCH) method. The non-doped and La- or Y- doped SrTiO3 powders could be synthesized by the PC process without precipitation of any second phase. The densely sintered bulks could also be obtained from these powders by the PCH method at 1473 or 1573 K for 5 min. In order to reduce electrical resistivity, TiB2 powder was added to the Y-doped SrTiO3. During the sintering, any reaction between SrTiO3 phase and TiB2 powder did not occur, resulting in the formation of Sr1-xYxTiO3/TiB2 composites. The TiB2 addition was quite effective not only for reduction in the electrical resistivity, but also for rapid densification during the sintering. The power factor of the Sr1-xYxTiO3/TiB2 composites over 800 K was similar to that of the Sr0.9Y0.1TiO3 polycrystal synthesized by the conventional solid state reaction method, indicating that the synthesis route via the PC process, the PCH method and TiB2 addition is quite promising as a rapid synthesis process at a low temperature of the thermoelectric SrTiO3 system.
社団法人粉体粉末冶金協会の論文
2009-06-15