Synthesis, Crystal Structure, and Transport Properties of Na22Si136

被引：19

作者：

Beekman, M. ^{[1
]}

Sebastian, C. P. ^{[2
]}

Grin, Yu. ^{[2
]}

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

机构：

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

[2] Max Planck Inst Chem Phys Fester Stoffe, D-01187 Dresden, Germany

来源：

JOURNAL OF ELECTRONIC MATERIALS | 2009年 / 38卷 / 07期

关键词：

Thermoelectric; clathrate; sodium; silicon; crystal structure; transport properties; THERMAL-CONDUCTIVITY; CLATHRATE COMPOUNDS; SILICON; GE; SI; TEMPERATURE; BA8GA16GE30;

D O I：

10.1007/s11664-008-0641-y

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

The type II clathrate Na22Si136 is prepared by the thermal decomposition of NaSi. Thermal analysis indicates this phase is metastable yet has a relatively high decomposition temperature. Rietveld analysis indicates that Na in the larger Si-28 cage is shifted off-center, analogous to observations in some type I clathrates. Temperature-dependent electrical and thermal transport properties are reported for Na22Si136, for which the spark plasma sintering technique was found to be effective in achieving intergrain sintering in the consolidated specimen. The potential that type II clathrate materials possess for thermoelectric applications is discussed.

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页码：1136 / 1141

页数：6

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