Thermoelectric properties of anisotropy-controlled p-type Bi-Te-Sb system via bulk mechanical alloying and shear extrusion

S. S. Kim; S. Yamamoto; T. Aizawa

doi:10.1016/j.jallcom.2003.11.141

Thermoelectric properties of anisotropy-controlled p-type Bi-Te-Sb system via bulk mechanical alloying and shear extrusion

S. S. Kim, S. Yamamoto, T. Aizawa

Regional Environment Systems

Research output: Contribution to journal › Article › peer-review

97 Citations (Scopus)

Abstract

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 Bi _0.4Sb_1.6Te₃ and Bi_0.5Sb _1.5Te₃ alloy green compact improves the preferred orientation factor of anisotropic crystallographic structure: F = 0.63 for Bi_0.4Sb_1.6Te₃ and F = 0.49 for Bi _0.5Sb_1.5Te₃, respectively. The electrical resistivity of Bi_0.4Sb_1.6Te₃ is well-controlled to be 0.989×10^-5Ωm, which is one-half of the hot-pressed specimen. Maximum power factor of Bi_0.4Sb_1.6Te ₃ is achieved to 4.33×10^-3W/mK². The bending strength of the material produced is also improved to be 120MPa, six times larger than that for the zone-melt specimen.

Original language	English
Pages (from-to)	107-113
Number of pages	7
Journal	Journal of Alloys and Compounds
Volume	375
Issue number	1-2
DOIs	https://doi.org/10.1016/j.jallcom.2003.11.141
Publication status	Published - 2004 Jul 28

Keywords

Anisotropy
Bismuth telluride
Orientation factor
Shear extrusion processing

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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10.1016/j.jallcom.2003.11.141

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title = "Thermoelectric properties of anisotropy-controlled p-type Bi-Te-Sb system via bulk mechanical alloying and shear extrusion",

abstract = "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 Bi 0.4Sb1.6Te3 and Bi0.5Sb 1.5Te3 alloy green compact improves the preferred orientation factor of anisotropic crystallographic structure: F = 0.63 for Bi0.4Sb1.6Te3 and F = 0.49 for Bi 0.5Sb1.5Te3, respectively. The electrical resistivity of Bi0.4Sb1.6Te3 is well-controlled to be 0.989×10-5Ωm, which is one-half of the hot-pressed specimen. Maximum power factor of Bi0.4Sb1.6Te 3 is achieved to 4.33×10-3W/mK2. The bending strength of the material produced is also improved to be 120MPa, six times larger than that for the zone-melt specimen.",

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author = "Kim, {S. S.} and S. Yamamoto and T. Aizawa",

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AU - Kim, S. S.

AU - Yamamoto, S.

AU - Aizawa, T.

PY - 2004/7/28

Y1 - 2004/7/28

N2 - 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 Bi 0.4Sb1.6Te3 and Bi0.5Sb 1.5Te3 alloy green compact improves the preferred orientation factor of anisotropic crystallographic structure: F = 0.63 for Bi0.4Sb1.6Te3 and F = 0.49 for Bi 0.5Sb1.5Te3, respectively. The electrical resistivity of Bi0.4Sb1.6Te3 is well-controlled to be 0.989×10-5Ωm, which is one-half of the hot-pressed specimen. Maximum power factor of Bi0.4Sb1.6Te 3 is achieved to 4.33×10-3W/mK2. The bending strength of the material produced is also improved to be 120MPa, six times larger than that for the zone-melt specimen.

AB - 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 Bi 0.4Sb1.6Te3 and Bi0.5Sb 1.5Te3 alloy green compact improves the preferred orientation factor of anisotropic crystallographic structure: F = 0.63 for Bi0.4Sb1.6Te3 and F = 0.49 for Bi 0.5Sb1.5Te3, respectively. The electrical resistivity of Bi0.4Sb1.6Te3 is well-controlled to be 0.989×10-5Ωm, which is one-half of the hot-pressed specimen. Maximum power factor of Bi0.4Sb1.6Te 3 is achieved to 4.33×10-3W/mK2. The bending strength of the material produced is also improved to be 120MPa, six times larger than that for the zone-melt specimen.

KW - Anisotropy

KW - Bismuth telluride

KW - Orientation factor

KW - Shear extrusion processing

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Thermoelectric properties of anisotropy-controlled p-type Bi-Te-Sb system via bulk mechanical alloying and shear extrusion

Abstract

Keywords

ASJC Scopus subject areas

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