Ba8Ga16Sn30 with type-I clathrate structure:: Drastic suppression of heat conduction
Ba8Ga16Sn30 with type-I clathrate structure:: Drastic suppression of heat conduction
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DOI：
10.1063/1.2831926
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发表时间：
2008-01-28
影响因子：
4
通讯作者：
Takabatake, T.
中科院分区：
文献类型：
--
作者：
Avila, M. A.;Suekuni, K.;Takabatake, T.
在过去的十年里，金属间化合物已经进入热电研究的主流。超大笼内的客体离子的不寻常振动干扰了笼声子，同时使电子流保持完整，提供了一种奇特的方式来实现在同一材料中的电和热传输方面的两全其美。在这里，我们提出的结构和热电性能的Ba 8 Ga 16 Sn 30单晶生长的I型笼形结构（β-BGS），显示出最低的记录的导热系数kappa（T）的任何散装化合物之一，同时仍然表现为电子作为一个重掺杂的n型半导体晶体。(c)2008年美国物理学会。
For the past decade, intermetallic clathrates have been rattling their way into mainstream research in thermoelectrics. The unusual vibrations of their guest ions inside oversized cages interfere with the cage phonons while leaving the electronic flow intact, providing an exotic way to achieve a best-of-both-worlds scenario in terms of electrical and thermal transport in the same material. Here, we present the structural and thermoelectric properties of Ba8Ga16Sn30 single crystals grown in the type-I clathrate structure (beta-BGS), showing one of the lowest recorded thermal conductivities kappa(T) for any bulk compound, while still behaving electronically as a heavily doped n-type semiconducting crystal. (c) 2008 American Institute of Physics.