Thermoelectric properties of anisotropy-controlled p-type Bi-Te-Sb system via bulk mechanical alloying and shear extrusion
Thermoelectric properties of anisotropy-controlled p-type Bi-Te-Sb system via bulk mechanical alloying and shear extrusion
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DOI：
10.1016/j.jallcom.2003.11.141
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发表时间：
2004-07-28
影响因子：
6.2
通讯作者：
Aizawa, T
中科院分区：
文献类型：
--
作者：
Kim, SS;Yamamoto, S;Aizawa, T
提出了用剪切挤压结合大块机械合金化的方法，从元素颗粒中制备出p型的BiTe-Sb材料。它具有良好的织构，从而提高了导电性和热电性能。Bi0.4Sb1.6Te3和Bi0.5Sb1.5Te3合金生坯的剪切挤压处理改善了各向异性晶体结构的择优取向因子：Bi0.4Sb1.6Te3和Bi0.5Sb1.5Te3的择优取向因子分别为F=0.63和F=0.49。Bi0.4Sb1.6Te_3的电阻率控制在0.989×10~(-5)欧姆，是热压样品的一半。最大功率因数Bi0.4Sb1.6Te3达到4.33×10~(-3)W/mK(2)。制得的材料的抗弯强度也提高到120 Mpa，是区熔体试件的6倍。(C)2003爱思唯尔B.V.保留所有权利。
Shear extrusion processing with combination of bulk mechanical alloying is proposed to yield the p-type Bi-Te-Sb materials from elemental granules. It has a well-developed texture so as to improve the electrical conductivity and thermoelectric properties. The shear extrusion processing in the Bi0.4Sb1.6Te3 and Bi0.5Sb1.5Te3 alloy green compact improves the preferred orientation factor of anisotropic crystallographic structure: F = 0.63 for Bi0.4Sb1.6Te3 and F = 0.49 for Bi0.5Sb1.5Te3, respectively. The electrical resistivity of Bi0.4Sb1.6Te3 is well-controlled to be 0.989 x 10(-5) Omega m, which is one-half of the hot-pressed specimen. Maximum power factor of Bi0.4Sb1.6Te3 is achieved to 4.33 x 10(-3) W/mK(2). The bending strength of the material produced is also improved to be 120 MPa, six times larger than that for the zone-melt specimen. (C) 2003 Elsevier B.V. All rights reserved.