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Thermoelectric Properties of Combustion Synthesized and Spark Plasma Sintered Sr1-xRxTiO3 (R = Y, La, Sm, Gd, Dy, 0<x≤0.1)

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Title: Thermoelectric Properties of Combustion Synthesized and Spark Plasma Sintered Sr1-xRxTiO3 (R = Y, La, Sm, Gd, Dy, 0<x≤0.1)
Authors: Zhang, Lihua Browse this author →KAKEN DB
Tosho, Tsuyoshi Browse this author
Okinaka, Noriyuki Browse this author →KAKEN DB
Akiyama, Tomohiro Browse this author →KAKEN DB
Keywords: thermoelectric properties
combustion synthesis
spark plasma sintering
rare earth
power factor
Issue Date: 1-Aug-2007
Publisher: The Thermoelectrics Society of Japan
Volume: 48
Issue: 8
Start Page: 2088
End Page: 2093
Publisher DOI: 10.2320/matertrans.E-MRA2007836
Abstract: Thermoelectric properties of combustion synthesized and spark plasma sintered rare-earth-doped (Y, La, Sm, Gd and Dy) SrTiO3 was investigated from room temperature to 870 K toward the viewpoint of energy and time saving without deterioration in thermoelectric properties. All the rare-earth-doped SrTiO3 were successfully synthesized and sintered with high purities and high densities. With temperature increasing, the absolute value of Seebeck coefficient increased and the electric conductivity decreased; the power factor of all the samples decreased except Y-doped sample in the experimental temperature range. In all the samples, the La-doped SrTiO3 and the Y-doped SrTiO3 had the highest and the lowest power factor, respectively. The dimensionless figure of merit ZT of La-doped samples with different doping amount was evaluated and the maximum ZT was 0.22, which was obtained at 800 K from Sr0.92La0.08TiO3 sample. Comparing Y and La-doped samples prepared by our method with that of conventional solid-state reaction method, the thermoelectric properties of our samples were relatively higher. Thus the combination of combustion synthesis and spark plasma sintering has a potential to prepare perovskite-oxide materials with relatively higher thermoelectric properties for high-temperature application.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 張 麗華

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