Competing anisotropic microstructures of Bi2(Te0.95Se0.05)3 thermoelectric materials by Bridgman technique

被引：7

作者：

Laopaiboon, Jintana ^{[1
]}

Pencharee, Somkid ^{[1
]}

Seetawan, Tossawat ^{[2
]}

Patakham, Ussadawut ^{[3
]}

Chayasombat, Bralee ^{[3
]}

Thanachayanont, Chanchana ^{[3
]}

机构：

[1] Ubon Ratchathani Univ, Dept Phys, Fac Sci, Ubon Ratchathani 34190, Thailand

[2] Sakhon Nakhon Rajabhat Univ, Fac Sci & Technol, Thermoelect Res Ctr, Sakhon Nakhon 47000, Thailand

[3] Natl Met & Mat Technol Ctr, Klongluang 12120, Pathumthani, Thailand

来源：

MATERIALS LETTERS | 2015年 / 141卷

关键词：

BiTeSe; Thermoelectric; Bridgman; Anisotropy; Orientation imaging microscopy; PERFORMANCE; FIGURES; GROWTH;

D O I：

10.1016/j.matlet.2014.11.124

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this study, Bridgman technique was used to grow Bi-2(Te0.95Se0.05)(3) thermoelectric materials. Pulling rates were varied at 0, 2, 4 and 8 mm/h. Anisotropic thermoelectric properties were investigated by measuring Seebeck coefficients, resistivities and power factors and microstructures by Orientation Imaging Microscopy (OIM) and X-ray diffraction, in the directions perpendicular and parallel to the pulling direction. An enhanced power factor of 2.01 mW/mK(2) in the direction parallel to the pulling direction was obtained for the pulling rate of 2 mm/h. The OIM result showed that infinitely long grains, with grain boundaries and crystal a-axis parallel to the pulling direction were responsible for the enhanced power factor. Competing effects of orientations of unit cells and grain boundaries were observed in all other samples. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：307 / 310

页数：4

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