High-temperature thermoelectric properties of (1 − x) SrTiO3 − (x) La1/3NbO3 ceramic solid solution

Deepanshu Srivastava, F. Azough, M. Molinari, S. C. Parker, R. Freer

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Ceramics based on SrTiO3 are of growing interest as thermoelectric materials because of their high-temperature stability and non-toxicity. Substitution of La and Nb into the perovskite structure provides opportunities to control both the microstructure and properties. Ceramic solid solutions of (1 − x) SrTiO3 − (x) La1/3NbO3 were prepared by the mixed oxide route, using compositional steps of x = 0.1. Pressed pellets were sintered at temperatures of 1573 K to 1723 K in air. Addition of aliovalent ions (La3+, Nb5+) on the A/B sites (Sr2+, Ti4+) led to A-Site cation deficiency in the stoichiometric compositions and other defect structures which increased carrier concentration. A maximum ZT of 0.004 was obtained for the x = 0.2 stoichiometric sample, although much higher ZT values are possible by sample reduction.

Original languageEnglish
Pages (from-to)1803-1808
JournalJournal of Electronic Materials
Volume44
Issue number6
Early online date18 Dec 2014
DOIs
Publication statusPublished - Jun 2015

Keywords

  • cation deficiency
  • figure of merit
  • LaNbO
  • SrTiO
  • thermoelectric

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