2011 Fiscal Year Final Research Report
Development of Magnetoelectric and Thermoelectric Devices Using Functionally Separated Nano Structures in Clathrate Compounds
| Project/Area Number |
21560332
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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 |
Electronic materials/Electric materials
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| Research Institution | Yamaguchi University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
ASADA Hironori 山口大学, 大学院・理工学研究科, 准教授 (70201887)
KISHIMOTO Kengo 山口大学, 大学院・理工学研究科, 助教 (50234216)
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| Project Period (FY) |
2009 – 2011
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| Keywords | クラスレート化合物 / 焼結体 / 薄膜 / 熱電気的特性 / 磁気的特性 |
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| Research Abstract |
In this study, many kinds of clathrates were synthesized, and their thermoelectric and magnetic properties were investigated. For thermoelectric clathrates, their high values of the dimensionless thermoelectric figure of merit were obtained for p-Ba_8Ga_ySn_<46-x-y>Ge_x(ZT=1.2). The carrier transport phenomena were considered based on the results of Hall measurements of single- and poly-crystals of type-VIII Ba_8Ga_<16>Sn_<30>. For magnetic clathrates, type-IBa_8Fe_yGa_xGe_<46-x-y> and type-III Ba_6Fe_1Ga_xGe_<24-x> showed the ferromagnetic behavior, and their Curie temperature TC reached to room temperature, which was higher than the reported TC. The TC depended on the carrier concentration, and this carrier concentration dependence could be explained by the RKKY mechanism. We also prepared the ferromagnetic films of these clathrates.
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