ID | 115306 |
Author |
Bumrungpon, Mongkol
Tokushima University
Morioka, Issei
Tokushima University
Yasufuku, Ryusuke
Tokushima University
Hirai, Toshiharu
Tokushima University
Hanasaku, Kenichi
Tokushima University
Hirota, Kenji
Tokushima University
Takagi, Katsuhiro
Tokushima University
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Keywords | eco-materials
thermoelectric materials
powder metallurgy
lead telluride
microstructure
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Content Type |
Journal Article
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Description | Undoped PbTe was melted at 1123 K, ball milled (BM) at rotation speeds from 90 to 180 rpm and hot pressed (HP) at 147 MPa and 650 K. Milling at 120 rpm produced the minimum phonon thermal conductivity of 1.29 W m−1 K−1 and average grain size of 0.80 µm. Phonon thermal conductivity was constant from coarse grain size to fine grain size of 1 µm and decreased suddenly at 0.80 µm. This tendency of phonon thermal conductivity corresponded to theoretical calculations with grain boundary scattering. However, the observed critical point of 1 µm was much larger than the calculated value of 0.03 µm. There was a significant inverse relationship between phonon thermal conductivity and FWHM of X-ray diffraction peaks. The low phonon thermal conductivity was associated with not only grain boundary scattering but high internal strain.
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Journal Title |
Materials Transactions
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ISSN | 13459678
13475320
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NCID | AA1151294X
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Publisher | The Japan Institute of Metals and Materials
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Volume | 61
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Issue | 10
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Start Page | 2025
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End Page | 2029
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Published Date | 2020-09-25
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EDB ID | |
DOI (Published Version) | |
URL ( Publisher's Version ) | |
FullText File | |
language |
eng
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TextVersion |
Publisher
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departments |
Science and Technology
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