直近一年間の累計
アクセス数 : ?
ダウンロード数 : ?
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
キーワード
Milling
Hot pressing
Electrical properties
ZrO2
資料タイプ
学術雑誌論文
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.
掲載誌名
Ceramics International
ISSN
02728842
cat書誌ID
AA10622625
AA11523301
出版者
Elsevier
46
9
開始ページ
13869
終了ページ
13876
発行日
2020-02-21
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/
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
著者版フラグ
著者版
部局
理工学系