2013 Fiscal Year Final Research Report
Synthesis of high performance carrier-density-controlled thermoelectric material with bimodal distribution of crystal gran size
| Project/Area Number |
24656445
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Single-year Grants |
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| Research Field |
Material processing/treatments
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| Research Institution | Osaka University |
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Principal Investigator |
KATSUYAMA Shigeru 大阪大学, 工学(系)研究科(研究院), 准教授 (00224478)
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| Project Period (FY) |
2012-04-01 – 2014-03-31
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| Keywords | 熱電変換 / 複合焼結体 / 電気伝導率 / 熱伝導率 / 酸化亜鉛 / パーコレーション |
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| Research Abstract |
In this study, sintered composites of ZnO compound with bimodal distribution of crystal grain size, whose carrier density was comtrolled, were synthesized,and their thermoelectric properties were investigated. (Zn0.898Mg0.1Al0.002)O powder with a crystal grain size of 1 micron was obtained by the polymerized complex method, and (Zn0.99Al0.01)O powder with a crystal grain size of 2-5 micron was obtained by hot pressing method. The electrical conductivity and thermal conductivity for the composite prepared from these powders generally increase with an increase of a volume fraction of (Zn0.99Al0.01)O powder, and the composite whose volume fraction of (Zn0.99Al0.01)O was about 33.3% showed a maximum dimensionless figure of merit, ZT, of 0.12 at 1073K.
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