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Thermoelectric phase diagram in a CaTiO3- SrTiO3 - BaTiO3 system
Yamamoto, Masahiro
Ohta, Hiromichi
Koumoto, Kunihito
open access
Copyright (2006) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.
Herein the authors propose a compositional thermoelectric phase diagram, which includes the density of states effective mass (md*d) carrier relaxation time (τ), and thermoelectric power factor (S2δ, where S and δ are Seebeck coefficient and electrical conductivity) for high-quality epitaxial films composed of 20%-Nb-doped CaTiO3–SrTiO3–BaTiO3 solid solutions [(Ca,Sr,Ba) ×(Ti0.8Nb0.2)O3]. The m*d values almost proportionally increase with the in-plane lattice parameter of (Ca,Sr,Ba)(Ti0.8Nb0.2)O3 epitaxial film, while the τ values drastically decrease when Ca and/or Ba are substituted for Sr in Sr(Ti0.8Nb0.2)O3, indicating that the Sr-site substitution negatively affects the thermoelectric performance of Nb-doped SrTiO3.
American Institute of Physics
2007-02-12
eng
journal article
VoR
http://hdl.handle.net/2237/8769
https://nagoya.repo.nii.ac.jp/records/7095
https://doi.org/10.1063/1.2475878
0003-6951
APPLIED PHYSICS LETTERS
90
7
072101
072101
https://nagoya.repo.nii.ac.jp/record/7095/files/AppPhysLett_90-72101.pdf
application/pdf
396.7 kB
2018-02-19