Titania embedded with nanostructured sodium titanate: Reduced thermal conductivity for thermoelectric application

Chengyan Liu, Lei Miao, Jianhua Zhou, Sakae Tanemura, Dongli Hu, Hui Gu

研究成果査読

2 被引用数 (Scopus)

抄録

Titania embedded with layer-cracking nanostructures (sodium titanate) was synthesized by a hydrothermal method and a subsequent sintering process. The structure and morphology were determined by x-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and N 2 adsorption-desorption experiments. In thermoelectric investigations, this nanocomposite has reduced thermal conductivity, where the minimum reaches about 2.4 W/m K at 700 C. This value is relatively low among the transition-metal oxides. Strong boundary scattering at the interfaces of the layered nanostructures and point defect scattering resulting from volatilization of Na+ ions seem to be main reasons for the suppression of phonon heat transfer. On the other hand, the power factor shows no apparent deterioration. Our results suggest that introduction of proper layer-cracking nanostructures into thermoelectric hosts might be effective to enhance their performance.

本文言語English
ページ(範囲)1680-1687
ページ数8
ジャーナルJournal of Electronic Materials
42
7
DOI
出版ステータスPublished - 2013 7
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • 電子工学および電気工学
  • 材料化学

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