Abstract
The shear extrusion processing combined with bulk mechanical alloying is proposed to yield the n-type Bi-Te-Se material from elemental granules. It has well-developed texture so as to improve the electric conductivity and thermoelectric properties. The shear extrusion processing of (Bi 2Se 3) 0.05(Bi 2Te 3) 0.95 alloy green compact can afford the preferred orientation factor of anisotropic crystallographic structure: F = 0.67. The electric resistivity of (Bi 2Se 3) 0.05(Bi 2Te 3) 0.95 is controlled to be 0.491 × 10 -5 (Ωm), which is 0.2 times lower than that of hot-pressed specimen. Maximum power factor is achieved to be 3.31 × 10 -3 (W/mK 2) even without any dopants. The bending strength of the material produced in this work is also improved to be 166 MPa, 1.7 times higher than that of conventional hot-extruded specimens.
| Original language | English |
|---|---|
| Pages (from-to) | 918-924 |
| Number of pages | 7 |
| Journal | Materials Transactions |
| Volume | 45 |
| Issue number | 3 |
| Publication status | Published - 2004 Mar |
| Externally published | Yes |
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Keywords
- Anisotropy
- Bismuth telluride
- n-type thermoelectric materials
- Orientation factor
- Shear extrusion processing
- Thermoelectric properties
ASJC Scopus subject areas
- Materials Science(all)
- Metals and Alloys
Cite this
Cristallographic anisotropy control of n-type Bi-Te-Se thermoelectric materials via bulk mechanical alloying and shear extrusion. / Kim, Sang Seok; Aizawa, Tatsuhiko.
In: Materials Transactions, Vol. 45, No. 3, 03.2004, p. 918-924.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Cristallographic anisotropy control of n-type Bi-Te-Se thermoelectric materials via bulk mechanical alloying and shear extrusion
AU - Kim, Sang Seok
AU - Aizawa, Tatsuhiko
PY - 2004/3
Y1 - 2004/3
N2 - The shear extrusion processing combined with bulk mechanical alloying is proposed to yield the n-type Bi-Te-Se material from elemental granules. It has well-developed texture so as to improve the electric conductivity and thermoelectric properties. The shear extrusion processing of (Bi 2Se 3) 0.05(Bi 2Te 3) 0.95 alloy green compact can afford the preferred orientation factor of anisotropic crystallographic structure: F = 0.67. The electric resistivity of (Bi 2Se 3) 0.05(Bi 2Te 3) 0.95 is controlled to be 0.491 × 10 -5 (Ωm), which is 0.2 times lower than that of hot-pressed specimen. Maximum power factor is achieved to be 3.31 × 10 -3 (W/mK 2) even without any dopants. The bending strength of the material produced in this work is also improved to be 166 MPa, 1.7 times higher than that of conventional hot-extruded specimens.
AB - The shear extrusion processing combined with bulk mechanical alloying is proposed to yield the n-type Bi-Te-Se material from elemental granules. It has well-developed texture so as to improve the electric conductivity and thermoelectric properties. The shear extrusion processing of (Bi 2Se 3) 0.05(Bi 2Te 3) 0.95 alloy green compact can afford the preferred orientation factor of anisotropic crystallographic structure: F = 0.67. The electric resistivity of (Bi 2Se 3) 0.05(Bi 2Te 3) 0.95 is controlled to be 0.491 × 10 -5 (Ωm), which is 0.2 times lower than that of hot-pressed specimen. Maximum power factor is achieved to be 3.31 × 10 -3 (W/mK 2) even without any dopants. The bending strength of the material produced in this work is also improved to be 166 MPa, 1.7 times higher than that of conventional hot-extruded specimens.
KW - Anisotropy
KW - Bismuth telluride
KW - n-type thermoelectric materials
KW - Orientation factor
KW - Shear extrusion processing
KW - Thermoelectric properties
UR - http://www.scopus.com/inward/record.url?scp=2442587573&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=2442587573&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:2442587573
VL - 45
SP - 918
EP - 924
JO - Materials Transactions
JF - Materials Transactions
SN - 1345-9678
IS - 3
ER -