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Reduction in the Thermal Conductivity of Thermoelectric Titanium Oxide by Introduction of Planar Defects

Published online by Cambridge University Press:  31 January 2011

Shunta Harada ,
Katsushi Tanaka  and
Haruyuki Inui
Shunta Harada
Affiliation:
harada.shunta@t02.mbox.media.kyoto-u.ac.jp, Kyoto University, Department of Materials Science and Engineering, Yoshida-hommachi, Sakyo-ku, Kyoto, Kyoto, 606-8501, Japan, +81-75-753-5473, +81-75-753-5461
Katsushi Tanaka
Affiliation:
k.tanaka@materials.mbox.media.kyoto-u.ac.jp, United States
Haruyuki Inui
Affiliation:
haruyuki.inui@materials.mbox.media.kyoto-u.ac.jp, Kyoto University, Department of Materials Science and Engineering, Sakyo-ku, Kyoto, 606-8501, Japan, +81-75-753-5467, +81-75-753-5461
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Abstract

Thermoelectric properties of a homologous series of Magnéli phase titanium oxides TinO2n-1 (n = 2, 3..) have been investigated. Dense polycrystalline specimens with nominal composition of TiO2-x (x = 0.10, 0.20) have been prepared by conventional hot-pressing. X-ray diffraction analysis has revealed that prepared specimens are slightly reduced during hot-pressing. Electrical conduction is of n-type for all prepared titanium oxides and electrical resistivity and absolute values of Seebeck coefficient decrease with increasing oxygen deficiency. The carrier concentration of Magnéli phase titanium oxide increases with increasing oxygen deficiency. Lattice thermal conductivity decreases with increasing oxygen deficiency by more than 60% at room temperature and 40% at 773K compared to TiO2, which can be due to the presence of dense planar defects. The largest thermoelectric figure of merit Z, 1.6×10-4 K-1 at 773K, was obtained in TiO1.90 hot pressed specimen.

Keywords

thermoelectriccrystallographic structurethermal conductivity
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1218: Symposium Z – Energy Harvesting–From Fundamentals to Devices , 2009 , 1218-Z01-04
Copyright
Copyright © Materials Research Society 2010

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