Effect of extra Te content on thermoelectric properties of p-type Bi2Te3-based materials

被引：0
|
作者：
Jiang, Jun [1 ]
Li, Yali [1 ]
Xu, Gaojie [1 ]
Cui, Ping [1 ]
Chen, Lidong [2 ]
Wang, Gang [3 ]
机构：
[1] Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315040, China
[2] Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
[3] Luoyang Institute of Refractories Research, Luoyang 471039, China
来源：
Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering | 2007年 / 36卷 / SUPPL. 2期
关键词：
Bismuth alloys - Chemical analysis - Electric conductivity - Electron probe microanalysis - Hole concentration - Phonon scattering - Seebeck coefficient - Tellurium compounds - Thermal conductivity - Zone melting;
D O I：
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学科分类号：
摘要：
P-type (Bi0.15Sb0.85)2Te3+x%Te (x=0-6) thermoelectric materials were prepared by zone-melting method. The micrograph and chemical composition of the second phase were analyzed by EPMA for the zone-melted ingots. The thermoelectric properties, including Seebeck coefficient (α), electrical conductivity (σ), and thermal conductivity (κ), were measured in the temperature range of 300-500 K. The results showed that the hole concentration decreased with the increase of extra Te content, and thus decreased electrical conductivity and scattering on phonons. However, the existing of the second phase increased the scattering on phonons; both scattering mechanisms made the phonon thermal conductivity decrease and then increase around room temperature. The maximum ZT value was about 0.92 for x=3.
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页码：404 / 407
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