Thermoelectric Properties of Dy-Doped SrTiO3 Ceramics

• Published in: Journal of electronic materials 2012-11, Vol.41 (11), p.3073-3076
• Main Authors: Liu, J., Wang, C.L., Peng, H., Su, W.B., Wang, H.C., Li, J.C., Zhang, J.L., Mei, L.M.
• Format: Article
• Language: English
• Subjects: Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Conductivity phenomena in semiconductors and insulators; Electrical engineering; Electronic transport in condensed matter; Electronics and Microelectronics; Exact sciences and technology; Instrumentation; Materials Science; Optical and Electronic Materials; Physics; Solid State Physics; Thermoelectric and thermomagnetic effects
• ISSN: 0361-5235; 1543-186X
• DOI: 10.1007/s11664-012-2219-y

Sr 1− x Dy x TiO 3 ( 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 Sr 0.9 Dy 0.1 TiO 3 sample.