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Thermoelectric Properties of Ruddlesden–Popper Phase n ‐Type Semiconducting Oxides: La‐, Nd‐, and Nb‐Doped Sr 3 Ti 2 O 7
Author(s) -
Lee Kyu Hyoung,
Wang Yi Feng,
Kim Sung Wng,
Ohta Hiromichi,
Koumoto Kunihito
Publication year - 2007
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/j.1744-7402.2007.02147.x
Subject(s) - materials science , thermoelectric effect , condensed matter physics , seebeck coefficient , doping , crystallite , superlattice , thermoelectric materials , phonon scattering , figure of merit , thermal conductivity , electrical resistivity and conductivity , analytical chemistry (journal) , metallurgy , thermodynamics , physics , chemistry , optoelectronics , chromatography , composite material , quantum mechanics
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 .