Influence of powder morphology on thermoelectric anisotropy of spark-plasma-sintered Bi-Te-based thermoelectric materials

被引：70

作者：

Kim, Dong Hwan ^{[1
]}

Kim, Cham ^{[1
,2
]}

Heo, Seong Hyeon ^{[1
,3
]}

Kim, Hoyoung ^{[1
]}

机构：

[1] Daegu Gyeongbuk Inst Sci & Technol, Taegu 704230, South Korea

[2] Pohang Univ Sci & Technol POSTECH, Dept Chem Engn, Pohang 790784, South Korea

[3] Pusan Natl Univ, Sch Mat Sci & Engn, Pusan 600735, South Korea

来源：

ACTA MATERIALIA | 2011年 / 59卷 / 01期

关键词：

Thermoelectric; Anisotropy; Morphology; Spark plasma sintering; SINGLE-CRYSTALS; SBI3-DOPED BI2TE2.85SE0.15; TRANSPORT-PROPERTIES; BISMUTH TELLURIDE; SOLID-SOLUTIONS; HOT EXTRUSION; BI2TE3; ALLOYS; (BI2TE3)(SB2TE3)(SB2SE3); SB2TE3;

D O I：

10.1016/j.actamat.2010.09.054

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The influence of the starting powders' morphology on the thermoelectric anisotropy of Bi-Te-based thermoelectric materials that are fabricated by spark plasma sintering has been investigated Starting powders with three types of morphologies are prepared through a chemical reaction method (nano-sized particles with a spherical shape), a conventional pulverization method (flake-like shape) and a gas atomizing method (spherical shape) The thermoelectric anisotropy of each sintered body is determined by measuring the electrical resistivity and thermal conductivity in both the parallel and perpendicular directions to the spark plasma sintering pressing direction The p-type Bi0 5Sb1 5Te3 0-sintered body that is composed of the spherically shaped powder has isotropic thermoelectric properties, while the same material composed of the flake-like powder shows anisotropic behavior The n-type Bi2Te3 sintered body has a relatively small anisotropy when it is composed from the spherically shaped powder (C) 2010 Acta Materialia Inc Published by Elsevier Ltd All rights reserved

引用

页码：405 / 411

页数：7

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