Evaluation of Specific Heat, Sound Velocity and Lattice Thermal Conductivity of Strained Nanocrystalline Bismuth Antimony Telluride Thin Films

2014 ◽  
Vol 44 (6) ◽  
pp. 1679-1687 ◽  
Author(s):  
D. Zheng ◽  
S. Tanaka ◽  
K. Miyazaki ◽  
M. Takashiri
Keyword(s):  
Thin Films ◽  
Thermal Conductivity ◽  
Specific Heat ◽  
Sound Velocity ◽  
Lattice Thermal Conductivity ◽  
Antimony Telluride ◽  
Bismuth Antimony Telluride ◽  
Bismuth Antimony

Thermal Conductivity of Nano-Porous Bismuth Antimony Telluride

2010 ◽  
Author(s):  
Saburo Tanaka ◽  
Masayuki Takashiri ◽  
Koji Miyazaki
Keyword(s):  
Thin Films ◽  
Thermal Conductivity ◽  
Phonon Scattering ◽  
Antimony Telluride ◽  
Bismuth Antimony Telluride ◽  
Porous Thin Films ◽  
Average Grain Size ◽  
Bismuth Antimony ◽  
Bulk Alloys ◽  
Thermal Conductivities

Bismuth antimony telluride (Bi0.4Te3.0Sb1.6) 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 Bi2Te3. 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.

Cross-plane thermal conductivity of highly oriented nanocrystalline bismuth antimony telluride thin films

2010 ◽  
Vol 490 (1-2) ◽  
pp. L44-L47 ◽  
Author(s):  
Masayuki Takashiri ◽  
Saburo Tanaka ◽  
Koji Miyazaki ◽  
Hiroshi Tsukamoto
Keyword(s):  
Thin Films ◽  
Thermal Conductivity ◽  
Antimony Telluride ◽  
Bismuth Antimony Telluride ◽  
Bismuth Antimony
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