Thermoelectric Properties of Al–Ga–Pd–Re Icosahedral Quasicrystals
-
- Takagiwa Y.
- Department of Advanced Materials Science, The University of Tokyo
-
- Kamimura T.
- Department of Advanced Materials Science, The University of Tokyo
-
- Okada J. T.
- Department of Advanced Materials Science, The University of Tokyo
-
- Kimura K.
- Department of Advanced Materials Science, The University of Tokyo
書誌事項
- タイトル別名
-
- Thermoelectric Properties of Al–Ga–Pd–Re Icosahedral Quasicrystals
この論文をさがす
抄録
Various compositions of Al–Ga–Pd–Re icosahedral quasicrystals (QCs) were synthesized using arc-melting and annealing methods, and their thermoelectric properties were investigated. With the same trend in the Seebeck coefficient as Al–Pd–Mn and Al–Pd–Re QCs, the Al–Ga–Pd–Re QC has a similar pseudogap electronic structure near the Fermi level. More particularly, we found that a sample with a nominal composition of Al66Ga4Pd21Re9 exhibited a higher Seebeck coefficient of 90 µV K−1 at 373 K, and is thus a highly efficient thermoelectric material. This dense sample, having neither cracks nor pores, shows a 1.5 times higher dimensionless figure of merit ZT of 0.18 compared with sintered Al71Pd20Re9. ZT enhancement through Ga substitution for Al is enabled through an increase in both electrical conductivity and Seebeck coefficient, and a decrease in phonon thermal conductivity. This behavior is discussed in terms of the precipitation of metallic secondary phases and the “weakly bonded rigid heavy clusters (WBRHCs)” scheme applicable to cluster-based solids including quasicrystals.
収録刊行物
-
- MATERIALS TRANSACTIONS
-
MATERIALS TRANSACTIONS 55 (8), 1226-1231, 2014
公益社団法人 日本金属学会
- Tweet
キーワード
詳細情報 詳細情報について
-
- CRID
- 1390001204253720704
-
- NII論文ID
- 130004455362
- 40020140577
-
- NII書誌ID
- AA1151294X
-
- ISSN
- 13475320
- 13459678
-
- NDL書誌ID
- 025617128
-
- 本文言語コード
- en
-
- データソース種別
-
- JaLC
- NDL
- Crossref
- CiNii Articles
- KAKEN
-
- 抄録ライセンスフラグ
- 使用不可