We report herein on Ruddlesden-Popper-type doped Srn+1 TinO3n+1 (n =2) as a potential candidate for n-type thermoelectric (TE) oxides. The TE properties of 5at.% La-, Nd-, and Nb-doped Sr3Ti2O7 polycrystalline ceramics were investigated and the origin of Seebeck coefficient was discussed from the viewpoint of the symmetry of TiO6 octahedra. A significant reduction in the lattice thermal conductivity was observed by the enhancement of phonon scattering at SrO/(SrTiO3)n interfaces originating from the inherent superlattice structure, and the maximum dimensionless figure of merit, ZT ∼0.15, at a 1000K value was obtained in 5at.% La-doped Sr3Ti2O7.
|Number of pages||6|
|Journal||International Journal of Applied Ceramic Technology|
|Publication status||Published - 2007 Aug|
All Science Journal Classification (ASJC) codes
- Ceramics and Composites
- Condensed Matter Physics
- Materials Chemistry