Development of Magnetoelectric and Thermoelectric Devices Using Functionally Separated Nano Structures in Clathrate Compounds

利用笼形化合物中功能分离的纳米结构开发磁电和热电器件

• 批准号: 21560332
• 负责人: KOYANAGI Tsuyoshi
• 金额: $ 3.08万
• 依托单位: Yamaguchi University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2009
• 资助国家: 日本
• 起止时间: 2009 至 2011
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21560332/
• 关键词: 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; 熱電特性; ゼーベック係数; 熱伝導率; RKKY相互作用; クラスレート; ラットリング

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.

本研究合成了多种笼形化合物，并对其热电性能和磁性能进行了研究。对于热电笼形化合物，p-Ba_8 Ga_ySn_ Ge_x（ZT=1.2）具有较高的无量纲热电优值<46-x-y>。本文根据第VIII型Ba_8Ga_Sn_3单晶和多晶的霍尔测量结果，讨论了载流子输运现象<16><30>。对于磁性包合物，IBa_8 Fe_yGa_xGe_<46-x-y>和III型Ba_6Fe_1Ga_xGe_<24-x>表现出铁磁行为，其居里温度TC达到室温，高于文献报道的TC。TC依赖于载流子浓度，这种载流子浓度依赖性可以用RKKY机制解释。我们还制备了这些笼形物的铁磁薄膜。

项目成果

Ba_8Ga_<16>Sn_<30>クラスレートの元素置換とその熱電気的・磁気的特性

Ba_8Ga_<16>Sn_<30>笼形物的元素取代及其热电磁性能

• 发表时间: 2011
• 作者: 加藤史明;佐野瑛一;丸山司;岸本堅剛;小柳剛
• 通讯作者: 小柳剛

Ba_8Ga_xSn_<46-x>単結晶及び焼結体の輸送特性

Ba_8Ga_xSn_<46-x>单晶及烧结体的输运特性

• 发表时间: 2011
• 作者: 上浦将来;小柳剛;岸本堅剛;河野欣;田口隆志
• 通讯作者: 田口隆志

Ba_8Ga_ySn_<46-x-y> Ge_xの熱電気的特性

Ba_8Ga_ySn_<46-x-y> Ge_x的热电性能

• 发表时间: 2012
• 作者: 山本拓典;岸本堅剛;小柳剛
• 通讯作者: 小柳剛

Thermoelectric properties and electronic structure of the type-I clathrate K_8Sn_<44>

I型笼形物K_8Sn_<44>的热电性能和电子结构

• 发表时间: 2010
• 作者: S. Nishi;M. Natori;N. Kojima;C. Morales;M. Yamaguchi;K.Kishimoto
• 通讯作者: K.Kishimoto

P型Sn-Ge混晶系クラスレート焼結体の熱電気的特性

P型Sn-Ge混晶笼形烧结体的热电性能

• 发表时间: 2011
• 作者: 山本拓典;岸本堅剛;赤井光治;浅田裕法;小柳剛
• 通讯作者: 小柳剛