Ⅰ-型锗基笼形物—极有希望的热电材料  

Type Ⅰ Ge clathrates - A promising thermoelectric materials

作　　者：蔡克峰[1] 

机构地区：[1]同济大学功能材料研究所,上海200092

出　　处：《功能材料与器件学报》2004年第2期139-144,共6页Journal of Functional Materials and Devices

基　　金：国家自然科学基金(No.50371062);教育部优秀青年教师资助计划;上海市重点学科建设项目的资助

摘　　要：对Ⅰ-型锗基笼形物的制备、晶体结构特别是热电性能等研究现状做了综述。Ⅰ-型锗基笼形物半导体是具有“声子玻璃、电子晶体”特性的热电材料。它具有笼子状的晶体结构,这种独特的框架结构决定了其具有良好的电性能,而通过填充合适的碱土金属或稀土金属原子到其笼子状的空隙中则可以大大降低体系的热导率,因而是很具希望的热电材料体系。要进一步提高该体系的热电性能,必须在优化填充原子的同时优化框架原子。The recent reseach developments of materials preparation, crystal structure, and especially thermoelectric properties of type -Ⅰ Ge clathrates are reviewed. Semiconducting type - Ⅰ Ge clathrates are thermoelectric materials that exhibit 'phonon glass, electron crystal' (PC-EC) behavior. They have cage -like structure which leads to their good electrical properties, meanwhile, their thermal conductivity can be markedly reduced via filling alkaline earth or lanthanon into their cades, therefore, they are promising materials for thermoelectric applications. It is suggested that both the filling atoms and the framework atoms must be optimized in order to further improve the thermoelectric properties.

关 键 词：I-型锗基笼形物 热电性能 材料制备 晶体结构 

分 类 号：O472.7[理学—半导体物理]