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

2016 Fiscal Year Final Research Report

• Project/Area Number: 26289260
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Structural/Functional materials
• Research Institution: Kobe 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
• Keywords: 熱電材料 / 酸化物 / マグネリ相 / 層状化合物 / 不純物元素

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.

Free Research Field

材料物性