Synthesis and thermoelectric properties of type-I clathrate compounds Si46-xPxTe8

被引：19
|
作者：
Kishimoto, Kengo [1 ]
Koyanagi, Tsuyoshi
Akai, Koji
Matsuura, Mitsuru
机构：
[1] Yamaguchi Univ, Grad Sch Sci & Engn, Ube, Yamaguchi 7558611, Japan
[2] Yamaguchi Univ, Media & Informat Technol Ctr, Ube, Yamaguchi 7558611, Japan
[3] Open Univ, Yamaguchi Study Ctr, Yamaguchi 7560884, Japan
来源：
JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS | 2007年 / 46卷 / 29-32期
关键词：
thermoelectric material; silicon clathrate; cationic clathrate; p-type; thermal conductivity;
D O I：
10.1143/JJAP.46.L746
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Tellurium-containing cationic clathrates Si46-xPxTe8 (x = 11-17) were synthesized using powder metallurgy. This study crystallized the Pm3n (No. 223) structure and showed a p-type conductivity; their band gap energy is estimated to be 1.24 eV. Although the Si46-xPxTe8 samples with x = 16 and 17 were intrinsic, the samples with x = 11-15 were degenerated semiconductors; their electrical conductivity a increased and their Seebeck coefficient S almost decreased with decreasing x. A power factor S-2 sigma of 12 mu W cm(-1) K-2 at 1000 K and a dimensionless figure of merit ZT of 0.45 at 900 K were achieved for a p-type silicon clathrate Si33P13Te8.
引用
收藏
页码：L746 / L748
页数：3
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