Effects of Sintering Temperature on Thermoelectric Device of La-Doped Strontium Titanate in the Combination of Combustion Synthesis and Spark Plasma Sintering

被引：10
|
作者：
Kikuchi, Asami [1 ]
Zhang, Lihua [2 ]
Okinaka, Noriyuki [3 ]
Tosho, Tsuyoshi [3 ]
Akiyama, Tomohiro [3 ]
机构：
[1] Hokkaido Univ, Grad Sch Engn, Sapporo, Hokkaido 0608628, Japan
[2] Univ Sci & Technol Beijing, Beijing 100083, Peoples R China
[3] Hokkaido Univ, Ctr Adv Res Energy Convers Mat, Sapporo, Hokkaido 0608628, Japan
来源：
MATERIALS TRANSACTIONS | 2009年 / 50卷 / 11期
关键词：
thermoelectric materials; perovskite oxide; combustion synthesis; spark plasma sintering;
D O I：
10.2320/matertrans.M2009225
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Thermoelectric properties of La-doped SrTiO3 were investigated in order to determine the optimum sintering temperature for its fabrication by using a combination of combustion synthesis and spark plasma sintering. Combustion-synthesized samples (Sr1-xLaxTiO3, x = 0.08) were subjected to spark plasma sintering at temperatures from 1513 to 1663 K. The average grain size of sintered Sr0.92La0.08TiO3 enlarged as sintering temperature rose up. The maximum average grain size was 23.5 mu m for a sintering temperature of 1663 K. The thermoelectric properties of sintered Sr0.92La0.08TiO3 were measured from room temperature to 1073 K. The optimum sintering temperature in the experimental sintering temperature range was 1633 K. Among the samples, the Sr0.92La0.08TiO3 sample sintercd at 1633 K showed the maximum power factor of 1.51 x 10(-3) Wm(-1)K(-1) at 375 K. Further, we investigated the effects of pressing direction during sintering on the thermoelectric properties of combustion-synthesized Sr0.92La0.08TiO3. The combustion-synthesized samples were sintered well along the pressing direction during sintering: therefore, the electric conductivity measured along the pressing direction during sintering was more than twice that measured along the direction perpendicular to the pressing direction during sintering. Thus, we concluded that pressing direction during sintering affected the electric property of Sr0.92La0.08TiO3. [doi: 10.2320/matertrans.M2009225]
引用
收藏
页码：2675 / 2679
页数：5
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