Cs/sub 8/Na/sub 16/Si/sub 136/和Cs/sub 8/Na/sub 16/Ge/sub 136/的温度相关结构和热电性能

Proceedings ICT2001. 20 International Conference on Thermoelectrics (Cat. No.01TH8589) Pub Date : 2001-06-08 DOI:10.1109/ICT.2001.979881

G. Nolas, D. VanDerveer, A. Wilkinson, J. Cohn

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引用次数: 1

摘要

本文报道了Cs/sub 8/Na/sub 16/Si/sub 136/和Cs/sub 8/Na/sub 16/Ge/sub 136/单晶x射线衍射数据测定的原子位移参数(ADPs)的温度依赖性以及多晶样品的热电性能。碱金属原子的adp值异常大。这些数据表明，大量的动态无序与组成笼形物框架的两个不同多面体内“咔嗒”的碱金属原子有关。输运测量表明这些化合物是金属导体。本文还讨论了II型包合物材料在热电应用中的潜力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Temperature dependent structural and thermoelectric properties of Cs/sub 8/Na/sub 16/Si/sub 136/ and Cs/sub 8/Na/sub 16/Ge/sub 136/

The temperature dependence of the atomic displacement parameters (ADPs) determined from single crystal x-ray diffraction data for Cs/sub 8/Na/sub 16/Si/sub 136/ and Cs/sub 8/Na/sub 16/Ge/sub 136/ as well as the thermoelectric properties of polycrystalline specimens is reported. Anomalously large values of the ADPs for the alkali-metal atoms are revealed. These data indicate that a large amount of dynamic disorder is associated with the "rattling" alkali-metal atoms inside the two different polyhedra that makeup the clathrate framework. Transport measurements show that these compounds are metallic conductors. The potential of type II clathrate materials for thermoelectric applications is also discussed.

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Proceedings ICT2001. 20 International Conference on Thermoelectrics (Cat. No.01TH8589)

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