Title :
Thermoelectric properties of layered perovskite-type Nb-doped SrO(SrTiO3)n (n = 1,2) Ruddlesden-Popper phases
Author :
Lee, K.H. ; Ohta, H. ; Koumoto, K.
Author_Institution :
CREST, JST, Kawaguchi
Abstract :
Thermoelectric (TE) properties of natural superlattice Ruddlesden-Popper (RP) phases were measured to elucidate their potential as TE materials, and the origin of the TE properties was discussed from the viewpoint of the shape of the TiO6 octahedron. Compared with the cubic perovskite-type phase Nb-doped SrTiO3, efficient reduction of the lattice thermal conductivity was observed by more than 50 % at room temperature and 30 % at 1000 K. There was a decrease in electrical conductivity owing to the randomly distributed insulating SrO layers in polycrystalline RP phases, and it was found that large TE power can be obtained in conjunction with high symmetry TiO6 octahedra
Keywords :
electrical conductivity; semiconductor materials; semiconductor superlattices; strontium compounds; thermal conductivity; thermoelectric power; 1000 K; 293 to 298 K; SrO-SrTi1-xNbxO3; electrical conductivity; lattice thermal conductivity; layered perovskite-type Nb-doped phases; superlattice Ruddlesden-Popper phases; thermoelectric property; Conducting materials; Dielectrics and electrical insulation; Lattices; Phase measurement; Shape measurement; Superlattices; Tellurium; Temperature; Thermal conductivity; Thermoelectricity;
Conference_Titel :
Thermoelectrics, 2006. ICT '06. 25th International Conference on
Conference_Location :
Vienna
Print_ISBN :
1-4244-0811-3
Electronic_ISBN :
1094-2734
DOI :
10.1109/ICT.2006.331285
