Thermoelectric Properties of Nb-Doped SrTiO 3 /TiO 2 Eutectic Solids Fabricated by Unidirectional Solidification

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Abstract

Undoped and Nb-doped SrTiO 3 /TiO 2 (STO/TO) eutectic solids were fabricated from the melt at a eutectic point of STO and TO by unidirectional solidification. Fabricated undoped and Nb:STO/TO eutectic solids were composed of the TiO 2 rod-like and the SrTiO 3 matrix phases, and the periodic and uniform eutectic morphology could be achieved in the Nb:STO/TO eutectic solids by stable control of the liquid–solid interface during the fabrication. The thermal conductivity of the Nb:STO/TO eutectic solid was less than half of that of the Nb:STO single crystal owing to the decrease of the lattice thermal conductivity by phonon scattering at the grain boundaries. The figures of merit ZT’s of the Nb:STO/TO eutectic solid, parallel and perpendicular to the growth direction, were ∼ 0.007 and ∼ 0.0004, respectively. The small ZT’s are attributable to the higher electrical resistivity originating from the insufficient carrier doping and high electrical resistivity of the TO phase.

Original languageEnglish
Pages (from-to)1827-1832
Number of pages6
JournalJournal of Electronic Materials
Volume48
Issue number4
DOIs
Publication statusPublished - 2019 Apr 15

Keywords

  • SrTiO
  • Thermoelectric material
  • TiO
  • eutectic material
  • unidirectional solidification

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering
  • Materials Chemistry

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