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ID 114833
Author
Bumrungpon, Mongkol Tokushima University
Hirota, Kenji Tokushima University
Takagi, Katsuhiro Tokushima University
Hanasaku, Kenichi Tokushima University
Hirai, Toshiharu Tokushima University
Morioka, Issei Tokushima University
Yasufuku, Ryusuke Tokushima University
Kitamura, Masato Tokushima University
Keywords
Milling
Hot pressing
Electrical properties
ZrO2
Content Type
Journal Article
Description
p-type Bi0.3Sb1.7Te3.0 thermoelectric materials were fabricated at various ball-milling speeds with yttria-stabilized zirconia (YSZ) ceramic balls in an YSZ vessel, and then hot-pressed. The powders milled at speeds of or higher than 150 rpm were completely alloyed and single-phase Bi0.3Sb1.7Te3.0 was obtained. The grain size of a disk sintered at 350 ℃ was approximately 1 μm at a fracture surface. The Seebeck coefficients of sintered disks fabricated by YSZ milling were higher while their electrical conductivities were lower than those of disks fabricated by using a stainless-steel vessel and Si3N4 balls, as the YSZ milling suppressed the contamination by materials acting as carrier dopants in the Bi0.3Sb1.7Te3.0 bulk. The contamination from the YSZ vessel and milling balls did not affect the phonon thermal conductivities of the Bi0.3Sb1.7Te3.0 bulk materials. The dimensionless figure of merit ZT of the sample milled at 150 rpm with the YSZ vessel and balls and sintered at 350 ℃ was approximately 1.7 times that of the sample milled with the stainless-steel vessel and Si3N4 balls. ZT remained above 1.0 and reached the peak of 1.16 (α: 295 μV/K, σ: 4.16 ×104 S/m, κ: 0.94 W/(m K)) at room temperature for the sample milled at 130 rpm and hot-pressed at 350 ℃. Thus, the thermoelectric properties can be improved by selecting appropriate milling vessels and balls.
Journal Title
Ceramics International
ISSN
02728842
NCID
AA10622625
AA11523301
Publisher
Elsevier
Volume
46
Issue
9
Start Page
13869
End Page
13876
Published Date
2020-02-21
Rights
© 2020. 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