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

fYear

2006

fDate

6-10 Aug. 2006

Firstpage

81

Lastpage

84

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-SrTi_1-xNb_xO₃; 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;

fLanguage

English

Publisher

ieee

Conference_Titel

Thermoelectrics, 2006. ICT '06. 25th International Conference on

Conference_Location

Vienna

ISSN

1094-2734

Print_ISBN

1-4244-0811-3

Electronic_ISBN

1094-2734

Type

conf

DOI

10.1109/ICT.2006.331285

Filename

4133241