Article

Journal of Electronic Materials

, Volume 41, Issue 11, pp 3073-3076

Thermoelectric Properties of Dy-Doped SrTiO3 Ceramics

  • J. LiuAffiliated withSchool of Physics, Shandong University Email author 
  • , C.L. WangAffiliated withSchool of Physics, Shandong UniversityState Key Laboratory of Crystal Materials, Shandong University
  • , H. PengAffiliated withSchool of Physics, Shandong University
  • , W.B. SuAffiliated withSchool of Physics, Shandong University
  • , H.C. WangAffiliated withSchool of Physics, Shandong University
  • , J.C. LiAffiliated withSchool of Physics, Shandong University
  • , J.L. ZhangAffiliated withSchool of Physics, Shandong UniversityState Key Laboratory of Crystal Materials, Shandong University
  • , L.M. MeiAffiliated withSchool of Physics, Shandong UniversityState Key Laboratory of Crystal Materials, Shandong University

Abstract

Sr1−x Dy x TiO3 (x = 0.02, 0.05, 0.10) ceramics were prepared by the reduced solid-state reaction method, and their thermoelectric properties were investigated from room temperature to 973 K. The resistivity increases with temperature, showing metallic behavior. The Seebeck coefficients tend to saturate at high temperatures, presenting narrow-band behavior, as proved by ab initio calculations of the electronic structure. The magnitudes of the Seebeck coefficient and the electrical resistivity decrease with increasing Dy content. At the same time, the thermal conductivity decreases because the lattice thermal conductivity is reduced by Dy substitution. The maximum value of the figure of merit reaches 0.25 at 973 K for the Sr0.9Dy0.1TiO3 sample.

Keywords

Strontium titanates thermoelectric properties narrow band