Thermoelectric properties of Ruddlesden-Popper phase n-type semiconducting oxides: La-, Nd-, and Nb-doped Sr3 Ti2O7

Kyu Hyoung Lee; Yi Feng Wang; Sung Wng Kim; Hiromichi Ohta; Kunihito Koumoto

doi:10.1111/j.1744-7402.2007.02147.x

Thermoelectric properties of Ruddlesden-Popper phase n-type semiconducting oxides: La-, Nd-, and Nb-doped Sr₃ Ti₂O₇

Kyu Hyoung Lee
, Yi Feng Wang
, Sung Wng Kim
, Hiromichi Ohta
, Kunihito Koumoto

Japan Science and Technology Agency
Nagoya University
Institute of Science Tokyo

Research output: Contribution to journal › Article › peer-review

22 Scopus citations

Abstract

We report herein on Ruddlesden-Popper-type doped Sr_n+1 Ti_nO_3n+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.

Original language	English
Pages (from-to)	326-331
Number of pages	6
Journal	International Journal of Applied Ceramic Technology
Volume	4
Issue number	4
DOIs	https://doi.org/10.1111/j.1744-7402.2007.02147.x
State	Published - Aug 2007
Externally published	Yes

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10.1111/j.1744-7402.2007.02147.x

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title = "Thermoelectric properties of Ruddlesden-Popper phase n-type semiconducting oxides: La-, Nd-, and Nb-doped Sr3 Ti2O7",

abstract = "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.",

author = "Lee, \{Kyu Hyoung\} and Wang, \{Yi Feng\} and Kim, \{Sung Wng\} and Hiromichi Ohta and Kunihito Koumoto",

year = "2007",

month = aug,

doi = "10.1111/j.1744-7402.2007.02147.x",

language = "English",

volume = "4",

pages = "326--331",

journal = "International Journal of Applied Ceramic Technology",

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TY - JOUR

T1 - Thermoelectric properties of Ruddlesden-Popper phase n-type semiconducting oxides

T2 - La-, Nd-, and Nb-doped Sr3 Ti2O7

AU - Lee, Kyu Hyoung

AU - Wang, Yi Feng

AU - Kim, Sung Wng

AU - Ohta, Hiromichi

AU - Koumoto, Kunihito

PY - 2007/8

Y1 - 2007/8

N2 - 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.

AB - 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.

UR - https://www.scopus.com/pages/publications/34447537750

U2 - 10.1111/j.1744-7402.2007.02147.x

DO - 10.1111/j.1744-7402.2007.02147.x

M3 - Article

AN - SCOPUS:34447537750

SN - 1546-542X

VL - 4

SP - 326

EP - 331

JO - International Journal of Applied Ceramic Technology

JF - International Journal of Applied Ceramic Technology

IS - 4

ER -

Thermoelectric properties of Ruddlesden-Popper phase n-type semiconducting oxides: La-, Nd-, and Nb-doped Sr₃ Ti₂O₇

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