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Thermal Conductivity of Nano-Porous Bismuth Antimony Telluride

[+] Author Affiliations
Saburo Tanaka, Koji Miyazaki

Kyushu Institute of Technology, Kitakyushu, Fukuoka, Japan

Masayuki Takashiri

Komatsu Ltd., Hiratsuka, Kanagawa, Japan

Paper No. IHTC14-23270, pp. 873-877; 5 pages
doi:10.1115/IHTC14-23270
From:
  • 2010 14th International Heat Transfer Conference
  • 2010 14th International Heat Transfer Conference, Volume 4
  • Washington, DC, USA, August 8–13, 2010
  • Conference Sponsors: Heat Transfer Division
  • ISBN: 978-0-7918-4939-2 | eISBN: 978-0-7918-3879-2
  • Copyright © 2010 by ASME

abstract

Bismuth antimony telluride (Bi0.4 Te3.0 Sb1.6 ) nano-porous thin films have been prepared and measured their thermal conductivities. The thin films exhibit an average grain size of 50 nm and random crystal orientation. The cross-plane thermal conductivity is measured by a differential 3ω method at temperature range from 100 to 300 K, and the determined thermal conductivities are from 0.09 to 0.18 W/(m·K). As compared with bulk alloys at the same atomic composition, the nano-porous thin films exhibit an eightfold reduction in the thermal conductivity. For more detail analysis, the reduction of the thermal conductivity is examined by a simplified phonon gas model on a single crystal of bulk Bi2 Te3 . The analytical model fairly agreed with the experimental results, and thus we consider that the thermal conductivity is reduced by the strong phonon scattering at the nano-pores.

Copyright © 2010 by ASME

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