ID | 114833 |
著者 |
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
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キーワード | Milling
Hot pressing
Electrical properties
ZrO2
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資料タイプ |
学術雑誌論文
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抄録 | 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.
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掲載誌名 |
Ceramics International
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ISSN | 02728842
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cat書誌ID | AA10622625
AA11523301
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出版者 | Elsevier
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巻 | 46
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号 | 9
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開始ページ | 13869
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終了ページ | 13876
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発行日 | 2020-02-21
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権利情報 | © 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/
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EDB ID | |
出版社版DOI | |
出版社版URL | |
フルテキストファイル | |
言語 |
eng
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著者版フラグ |
著者版
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部局 |
理工学系
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