2012 Fiscal Year Final Research Report
Study on control of guest-host interactions and thermoelectric properties in clathrate semiconductors
| Project/Area Number |
22560708
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Structural/Functional materials
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| Research Institution | Tokyo University of Science, Yamaguchi |
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Principal Investigator |
ANNO Hiroaki 山口東京理科大学, 工学部, 教授 (60279106)
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| Project Period (FY) |
2010 – 2012
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| Keywords | 熱電変換材料 / クラスレート / 半導体物性 / 省エネルギー |
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| Research Abstract |
New silicon clathrates, thermoelectric semiconductors, were developed by partial substitution of europium for barium on guest sites. The europium guest was found to occupy preferentially the crystallographic position 2a site in the voids in the crystal structure. The europium substitution had a significant influence on the electronic structure, resulting in an enhancement of the Seebeck coefficient due to an increased election effective mass. Further, the europium substitution caused a marked reduction in the lattice thermal conductivity due to an enhanced “rattling” scattering (resonant scattering) of phonons because the Einstein temperature of the guest atoms on the 2a site was reduced.
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