Synthesis and transport properties of type II clathrates

被引：2

作者：

Beekman, M ^{[1
]}

Gryko, J ^{[1
]}

Rubin, HF ^{[1
]}

Kaduk, JA ^{[1
]}

Wong-Ng, W ^{[1
]}

Nolas, GS ^{[1
]}

机构：

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

来源：

ICT: 2005 24TH INTERNATIONAL CONFERENCE ON THERMOELECTRICS | 2005年

关键词：

D O I：

10.1109/ICT.2005.1519927

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

We present electrical resistivity and thermal conductivity for low alkali content Na1Si136, and compare it to the "fully loaded" CS8Na16Si136. Our results show that the electrical resistivities of the high and low alkali content materials differ greatly. Na1Si136 possesses a low thermal conductivity, similar in magnitude and temperature dependence to that of the "empty" clathrate Si-136. Extensive attempts at synthesizing NaxGe136 did not produce the clathrate phase in high enough yield for transport measurements, but instead an initially unidentified Na-Ge phase was prevalent. In order to clarify confusion in the literature, we propose a structural model for this novel phase, with resulting composition Na1-xGe3. The potential of type II clathrates for thermoelectric applications is reviewed.

引用

页码：219 / 222

页数：4

共 19 条

[1]

Beekman M, 2004, ELEC SOC S, V2003, P271

[2] Clathrates of group 14 with alkali metals: An exploration [J].