Synthesis and thermal conductivity of type II silicon clathrates

被引：50

作者：

Beekman, M. ^{[1
]}

Nolas, G. S. ^{[1
]}

机构：

[1] Univ S Florida, Dept Phys, Tampa, FL 33620 USA

来源：

PHYSICA B-CONDENSED MATTER | 2006年 / 383卷 / 01期

关键词：

silicon; clathrate; thermal conductivity; framework compound; GE; SI; SI-136;

D O I：

10.1016/j.physb.2006.03.070

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We have synthesized and characterized polycrystalline Na1Si136 and Na8Si136, compounds possessing the type 11 clathrate hydrate crystal structure. Resistivity measurements from 10 to 300K indicate very large resistivities in this temperature range, with activated temperature dependences indicative of relatively large band gap semiconductors. The thermal conductivity is very low; two orders-of-magnitude lower than that of diamond-structure silicon at room temperature. The thermal conductivity of Na8Si136 displays a temperature dependence that is atypical of crystalline solids and more indicative of amorphous materials. This work is part of a continuing effort to explore the many different compositions and structure types of clathrates, a class of materials that continues to be of interest for scientific and technological applications. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：111 / 114

页数：4

共 17 条

[1] On the clathrate form of elemental silicon, Si136:: preparation and characterisation of NaxSi136 (X → 0) [J].