ID | 117170 |
Author |
Asai, Jun
Tokushima University
Bumbrungpon, Mongkol
Tokushima University
Tsubochi, Toshiya
Tokushima University
Kanaya, Takayuki
Tokushima University
Tachii, Masaya
Tokushima University
Maeda, Toshiki
Tokushima University
Iwamoto, Taku
Tokushima University
Kanda, Chika
Tokushima University
|
Keywords | Electrical properties
Thermal conductivity
Hot pressing
Thermoelectric materials
|
Content Type |
Journal Article
|
Description | The effects of the addition of lead as one of the multiple dopants in p-type Bi0.3−xSb1.7Te3.0+0.01Pbx (x = 0, 0.001, 0.002, 0.003) fabricated by mechanical alloying followed by hot pressing were investigated. Measurements by X-ray diffraction (XRD), differential thermal analysis (DTA), and scanning electron microscopy (SEM) showed the same matrix morphology. The second phase by doped elements was not confirmed by transmission electron microscopy (TEM). By using the lead addition results and previously studied tellurium doping effects, the Lorenz number L was evaluated to be 0.73–1.18 × 10−8 W S−1 K−2. The scattering parameter γ and reduced Fermi energy η were estimated by using expressions on the basis of a one-electron approximation, measured Seebeck coefficients, and the estimated L at room temperature. The γ ranged approximately from −1.06 to −0.60 and showed a mutual effect of acoustic and optical phonon scattering. The relationship between a dimensionless figure of merit ZT and η was clarified. The optimum η was determined as −1.25 at ZT = 1.26. From these results, multi-doped Bi0.3Sb1.7Te3.0 could be applied to evaluate L, γ, and η at a constant temperature.
|
Journal Title |
Ceramics International
|
ISSN | 02728842
|
NCID | AA10622625
AA11523301
|
Publisher | Elsevier
|
Volume | 48
|
Issue | 9
|
Start Page | 12520
|
End Page | 12528
|
Published Date | 2022-01-17
|
Rights | © 2022. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
|
EDB ID | |
DOI (Published Version) | |
URL ( Publisher's Version ) | |
FullText File | |
language |
eng
|
TextVersion |
Author
|
departments |
Science and Technology
|