Thermoelectric Properties of Ruddlesden–Popper Phase n ‐Type Semiconducting Oxides: La‐, Nd‐, and Nb‐Doped Sr 3 Ti 2 O 7
Year: 2007
Type: article
Abstract: We report herein on Ruddlesden–Popper‐type doped Sr n +1 Ti n O 3 n +1 ( n =2) as a potential candidate for n ‐type thermoelectric (TE) oxides. The TE properties of 5 at.% La‐, Nd‐, and Nb‐doped Sr 3 Ti 2 O 7 polycrystalline ceramics were investigated and the origin of Seebeck coefficient was discussed from the viewpoint of the symmetry of TiO 6 octahedra. A significant reduction in the lattice thermal conductivity was observed by the enhancement of phonon scattering at SrO/(SrTiO 3 ) n interfaces originating from the inherent superlattice structure, and the maximum dimensionless figure of merit, ZT ∼0.15, at a 1000 K value was obtained in 5 at.% La‐doped Sr 3 Ti 2 O 7 .
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2114146546