Faculty Profiles - HARADA Shunta

Papers - HARADA Shunta

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Thermoelectric properties and crystallographic shear structures in titanium oxides of the Magneli phases Reviewed Open Access

Shunta Harada, Katsushi Tanaka, Haruyuki Inui

JOURNAL OF APPLIED PHYSICS Vol. 108 ( 8 ) 2010.10

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER INST PHYSICS

The thermoelectric properties of Magneli phase titanium oxides TinO2n-1 (n=2,3,...) have been investigated, paying special attention to how the thermoelectric performance can be altered by changing the microstructure. Dense polycrystalline specimens with nominal composition of TiO2-x (x=0.05, 0.10, 0.15, and 0.20) prepared by conventional hot-pressing are all identified to be one of the Magneli phases, in which crystallographic shear planes are regularly introduced according to the oxygen deficiency. Electrical conduction is n-type for all specimens and the carrier concentration increases with the increase in the oxygen deficiency. The values of lattice thermal conductivity, on the other hand, decrease with the increase in the oxygen deficiency, which can be attributed to phonon scattering at the crystallographic shear plane. The largest value of thermoelectric figure of merit Z, 1.6 X 10(-4) K-1 was obtained at 773 K for the hot-pressed specimen of TiO1.90. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3498801]

DOI： 10.1063/1.3498801

Web of Science

Scopus

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

S. Harada, K. Tanaka, H. Inui

Material Research Society Symposium Proceedings Vol. 1218 2010.9

Soft X-ray photoelectron spectroscopy of heusler-type thermoelectric alloys Fe<inf>2-x-y</inf>lr<inf>y</inf>v<inf>1+x</inf>Al

Harada S.

Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy Vol. 57 ( 4 ) page： 213 - 217 2010.4

Thermoelectric properties of ternary and Al-containing quaternary Ru1-xRexSiy chimney-ladder compound Reviewed

K. Kishida, A. Ishida, T. Koyama, S. Harada, N. L. Okamoto, K. Tanaka, H. Inui

Acta Materialia Vol. 57 ( 6 ) page： 2010-2019 2009.4

Change in the thermoelectric properties with the variation in the defect structure of ReSi1.75 Reviewed

S. Harada, K. Tanaka, K. Kishida, N. L. Okamoto, H. Inui

Material Research Society Symposium Proceedings Vol. 1128 page： 9-14 2009

Improvement of Grain-Boundary Conductivity of Trivalent Cation-Doped Barium Zirconate Sintered at 1600°C by Co-Doping Scandium and Yttrium

S. Imashuku, T. Uda, Y. Nose, K. Kishida, S. Harada, H. Inui and Y. Awakura

Journal of Electrochemical Society Vol. 155 ( 6 ) page： B581-B586 2008.4

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Papers - HARADA Shunta