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Exclusive control of electric and thermal conductivities of thermoelectric materials having a natural superlattice structure

Research Project

Project/Area Number 26289260
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypePartial Multi-year Fund
Section一般
Research Field Structural/Functional materials
Research InstitutionKobe University

Principal Investigator

TANAKA Katsushi  神戸大学, 工学(系)研究科(研究院), 教授 (30236575)

Research Collaborator SATO Hiroki  
TAKAI Yutaka  
Project Period (FY) 2014-04-01 – 2017-03-31
Project Status Completed (Fiscal Year 2016)
Budget Amount *help
¥16,640,000 (Direct Cost: ¥12,800,000、Indirect Cost: ¥3,840,000)
Fiscal Year 2016: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2015: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2014: ¥10,660,000 (Direct Cost: ¥8,200,000、Indirect Cost: ¥2,460,000)
Keywords熱電材料 / 酸化物 / マグネリ相 / 層状化合物 / 不純物元素 / 層状構造 / 廃熱利用 / 強相関電子系 / 環境材料 / 格子欠陥 / 構造・機能材料 / 面欠陥 / フォノン散乱
Outline of Final Research Achievements

Partially reduced TiO2-x (x~0.1: Magnelli phase) consists of a regular stacking of TiO2 and Ti2O3 layers as a natural superlattice structure. To reduce the thermal conductivity without changing electrical properties, quadlivalient impurities of Zr or Sn are added to the crystal. Zr makes solid solution as expected but Sn does not make solid solution. Thermal conductivity of Magnelli phase does not significantly change upon alloying with Zr. On the other hand, the alloying lowers electric conductivity. As a result, thermoelectric properties are not improved by the alloying with Zr.

Report

(4 results)
  • 2016 Annual Research Report   Final Research Report ( PDF )
  • 2015 Annual Research Report
  • 2014 Annual Research Report
  • Research Products

    (3 results)

All 2016 2015

All Presentation (3 results) (of which Int'l Joint Research: 1 results)

  • [Presentation] Thermoelectric properties in titanium oxides doped with quadrivalent impurities2016

    • Author(s)
      Y. Takai, H. Sato, K. Tanaka
    • Organizer
      9th Pacific Rim Int. Conf. on Advanced Materials and Processing
    • Place of Presentation
      Kyoto, Japan
    • Year and Date
      2016-08-01
    • Related Report
      2015 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 酸素欠損型チタン酸化物の熱電特性における四価不純物の効果2016

    • Author(s)
      高井優,佐藤博紀,田中克志
    • Organizer
      日本金属学会2016春期大会
    • Place of Presentation
      東京,日本
    • Year and Date
      2016-03-23
    • Related Report
      2015 Annual Research Report
  • [Presentation] Ti基マグネリ相中の四価不純物の存在状態2015

    • Author(s)
      佐藤博紀
    • Organizer
      第3回グリーンエネルギー材料のマルチスケール創製研究会
    • Place of Presentation
      南条市,沖縄県,日本
    • Year and Date
      2015-11-05
    • Related Report
      2015 Annual Research Report

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Published: 2014-04-04   Modified: 2018-03-22  

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