Key to enhance thermoelectric performance by controlling crystal size of strontium titanate

Jun Wang, Xinxin Ye, Xinba Yaer, Yin Wu, Boyu Zhang, Lei Miao

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

One-step molten salt synthesis process was introduced to fabricate nano to micrometer sized SrTiO3 powders in which effects of synthesis temperature, oxide-to-flux ratios and raw materials on the generation of SrTiO3 powders were examined. 100 nm or above sized pure SrTiO3 particles were obtained at relatively lower temperature of 900°C. Micro-sized rhombohedral crystals with a maximum size of approximately 12 μm were obtained from SrCO3 or Sr(NO3)2 strontium source with 1:1 O/S ratio. Controlled crystal size and morphology of Nb-doped SrTiO3 particles are prepared by using this method to confirm the performance of thermoelectric properties. The Seebeck coefficient obtained is significantly high when compared with the reported data, and the high ratio of nano particles in the sample has a positive effect on the increase of Seebeck coefficient too, which is likely due to the energy filtering effect at large numbers of grain boundaries resulting from largely distributed structure.

Original languageEnglish
Article number1550167
JournalModern Physics Letters B
Volume29
Issue number28
DOIs
Publication statusPublished - 2015 Oct 20
Externally publishedYes

Keywords

  • micro particles
  • Molten salt synthesis
  • nano particles
  • strontium titanate
  • thermoelectric materials

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Condensed Matter Physics

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