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Optimization of Sintering Temperature for Maximizing Dimensionless Figure of Merit of La-Doped Strontium Titanate Thermoelectric Material in the Combination of Combustion Synthesis with Post Spark Plasma Sintering
| Title: | Optimization of Sintering Temperature for Maximizing Dimensionless Figure of Merit of La-Doped Strontium Titanate Thermoelectric Material in the Combination of Combustion Synthesis with Post Spark Plasma Sintering |
| Authors: | Kikuchi, Asami Browse this author | | Zhang, Lihua Browse this author →KAKEN DB | | Okinaka, Noriyuki Browse this author →KAKEN DB | | Tosho, Tsuyoshi Browse this author | | Akiyama, Tomohiro Browse this author →KAKEN DB |
| Keywords: | thermoelectric materials | | perovskite oxide | | combustion synthesis | | spark plasma sintering |
| Issue Date: | 1-Oct-2010 |
| Publisher: | The Japan Institute of Metals |
| Journal Title: | MATERIALS TRANSACTIONS |
| Volume: | 51 |
| Issue: | 10 |
| Start Page: | 1919 |
| End Page: | 1922 |
| Publisher DOI: | 10.2320/matertrans.M2010102 |
| Abstract: | This paper describes thermoelectric properties of La-doped SrTiO3 prepared by using a combination of combustion synthesis (CS) with post spark plasma sintering (SPS), on which effects of sintering temperature were mainly examined. In experimental, combustion-synthesized (CSed) samples (Sr1−xLaxTiO3, x=0.08) were spark-plasma-sintered (SPSed) at temperatures from 1513 to 1663 K and the thermoelectric properties of sintered Sr0.92La0.08TiO3 were measured from room temperature to 1073 K. In experimental sintering temperature range, sintering temperature didn’t heavily affect the average grain size of sintered SLTO in the case that sintering temperature ranges from 1543 to 1603 K. However, when sintering temperature rose over 1603 K, the average grain size of sintered SLTO was dramatically affected and it increased with sintering temperature. With increasing sintering temperature, the effects of phonon scattering at grain boundaries decreased therefore, thermal conductivity of all sintered samples increased with sintering temperature. With increasing sintering temperature, electric conductivity of sintered SLTO increased and absolute value of Seebeck coefficient of sintered SLTO decreased because sintering at higher temperature caused the more oxygen defects which generate the larger carrier density. In conclusion, the product sintered at 1573 K showed the maximum of the dimensionless figure of merit of 0.16 at 1005 K. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/77013 |
| 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)
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Submitter: 沖中 憲之
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