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The thermal conductivities are very close between the n=1 and 2 phases either doped with Nb5^+ or Ln^3+ and decreased by ~60% at room temperature and ~30% at 1000 K as compared to that of SrTiO3, which is likely due to an enhanced phonon scattering at the SrO/ (SrTiO3)n (n=1,2) interfaces. The density of states effective mass md *(1.8.2.4 m0) and consequently the Seebeck coefficient \\midS\\mid in Nb^5+-doped samples are fairly smaller than those reported for SrTiO3, which probably resulted from a deterioration of DOS due to the formation of the singly degenerate a1g (Ti3dxy) orbital as the conduction band bottom, which should be induced by the distortion of TiO6 octahedra in (SrTiO3)n layers. However, in the Ln^3+-doped SrO(SrTiO3)2, the TiO6 octahedra were found to be restored, in contrast to the Nb5^+-doped, with a gradually increasing O.Ti.O bond angle in the (100) plane at high temperatures, which would lead to the formation of triply degenerate Ti 3d-t2g (dxy, dyz, and dxz) orbitals to cause a significant enhancement in md*(7.5 m0 at 1000 K) and consequently in  \\midS\\mid . 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  1. B200 工学部/工学研究科
  2. B200a 雑誌掲載論文
  3. 学術雑誌

Thermoelectric properties of electron doped SrO(SrTiO3)n (n=1,2) ceramics

http://hdl.handle.net/2237/12629
http://hdl.handle.net/2237/12629
8d7517a6-822b-43cc-9c38-ef2da2fb142f
名前 / ファイル ライセンス アクション
JApplPhys_105_103701.pdf JApplPhys_105_103701.pdf (1.1 MB)
Item type 学術雑誌論文 / Journal Article(1)
公開日 2010-01-21
タイトル
タイトル Thermoelectric properties of electron doped SrO(SrTiO3)n (n=1,2) ceramics
言語 en
著者 Wang, Yifeng

× Wang, Yifeng

WEKO 32398

en Wang, Yifeng

Search repository
Lee, Kyu Hyoung

× Lee, Kyu Hyoung

WEKO 32399

en Lee, Kyu Hyoung

Search repository
Ohta, Hiromichi

× Ohta, Hiromichi

WEKO 32400

en Ohta, Hiromichi

Search repository
Koumoto, Kunihito

× Koumoto, Kunihito

WEKO 32401

en Koumoto, Kunihito

Search repository
アクセス権
アクセス権 open access
アクセス権URI http://purl.org/coar/access_right/c_abf2
権利
言語 en
権利情報 Copyright (2009) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior per mission of the author and the American Institute of Physics.
キーワード
主題Scheme Other
主題 ceramics
キーワード
主題Scheme Other
主題 conduction bands
キーワード
主題Scheme Other
主題 crystal structure
キーワード
主題Scheme Other
主題 doping
キーワード
主題Scheme Other
主題 effective mass
キーワード
主題Scheme Other
主題 electronic density of states
キーワード
主題Scheme Other
主題 gadolinium
キーワード
主題Scheme Other
主題 hot pressing
キーワード
主題Scheme Other
主題 interface phonons
キーワード
主題Scheme Other
主題 lanthanum
キーワード
主題Scheme Other
主題 neodymium
キーワード
主題Scheme Other
主題 samarium
キーワード
主題Scheme Other
主題 Seebeck effect
キーワード
主題Scheme Other
主題 strontium compounds
キーワード
主題Scheme Other
主題 thermal conductivity
抄録
内容記述 Crystal structure and thermoelectric properties of Nb^5+- and Ln^3+-(rare earth: La^3+, Nd^3+, S^3+, and Gd^3+) doped SrO(SrTiO3)n (n=1,2) ceramics, which were fabricated by conventional hot-pressing, were measured to clarify the effects of Ti^4+- and Sr^2+-site substitution on the thermoelectric properties. The thermal conductivities are very close between the n=1 and 2 phases either doped with Nb5^+ or Ln^3+ and decreased by ~60% at room temperature and ~30% at 1000 K as compared to that of SrTiO3, which is likely due to an enhanced phonon scattering at the SrO/ (SrTiO3)n (n=1,2) interfaces. The density of states effective mass md *(1.8.2.4 m0) and consequently the Seebeck coefficient \midS\mid in Nb^5+-doped samples are fairly smaller than those reported for SrTiO3, which probably resulted from a deterioration of DOS due to the formation of the singly degenerate a1g (Ti3dxy) orbital as the conduction band bottom, which should be induced by the distortion of TiO6 octahedra in (SrTiO3)n layers. However, in the Ln^3+-doped SrO(SrTiO3)2, the TiO6 octahedra were found to be restored, in contrast to the Nb5^+-doped, with a gradually increasing O.Ti.O bond angle in the (100) plane at high temperatures, which would lead to the formation of triply degenerate Ti 3d-t2g (dxy, dyz, and dxz) orbitals to cause a significant enhancement in md*(7.5 m0 at 1000 K) and consequently in \midS\mid . Accordingly, the maximum dimensionless figure of merit ZT~0.24 obtained in 5%-Gd^3+-doped SrO(SrTiO3)2 at 1000 K is about 70% larger than that of Nb-doped SrO(SrTiO3)2 (ZT1000 ~K0.14).
言語 en
内容記述タイプ Abstract
出版者
言語 en
出版者 American Institite of Physics
言語
言語 eng
資源タイプ
資源タイプresource http://purl.org/coar/resource_type/c_6501
タイプ journal article
出版タイプ
出版タイプ VoR
出版タイプResource http://purl.org/coar/version/c_970fb48d4fbd8a85
DOI
関連タイプ isVersionOf
識別子タイプ DOI
関連識別子 https://doi.org/10.1063/1.3117943
ISSN
収録物識別子タイプ PISSN
収録物識別子 0021-8979
書誌情報 en : JOURNAL OF APPLIED PHYSICS

巻 105, 号 10, p. 103701, 発行日 2009-05-18
フォーマット
application/pdf
著者版フラグ
値 publisher
URI
識別子 http://hdl.handle.net/2237/12629
識別子タイプ HDL
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