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Nanostructured AgPb(m)SbTe(m+2) system bulk materials with enhanced thermoelectric performance
Min Zhou1, Jing-Feng Li, Takuji Kita
1State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China.
Journal of the American Chemical Society
|March 11, 2008
Summary
Annealing nanostructured AgPbSbTe thermoelectric materials significantly improved performance. Optimized samples achieved low thermal conductivity and high ZT values, demonstrating enhanced thermoelectric potential.
Area of Science:
- Materials Science
- Solid State Physics
- Nanotechnology
Background:
- Thermoelectric materials convert heat to electricity.
- Improving their efficiency is crucial for energy harvesting.
- Nanostructuring offers a route to enhance thermoelectric properties.
Purpose of the Study:
- To investigate the effect of annealing on nanostructured AgPbSbTe.
- To optimize microstructure and thermoelectric performance.
- To understand the relationship between annealing, microstructure, and properties.
Main Methods:
- Fabrication using mechanical alloying (MA) and spark plasma sintering (SPS).
- Post-fabrication annealing treatments for extended durations.
- Microstructural characterization and thermoelectric property measurements.
Main Results:
- Annealing reduced both electrical resistivity and thermal conductivity.
- Achieved low electrical resistivity (2 x 10^-3 Ohm-cm) and thermal conductivity (0.89 W m^-1 K^-1).
- A peak ZT value of 1.5 at 700 K was obtained after 30 days of annealing.
Conclusions:
- Appropriate annealing is effective in enhancing thermoelectric performance.
- Nanoscopic Ag/Sb-rich regions contribute to low thermal conductivity.
- Optimized AgPbSbTe materials show significant potential for thermoelectric applications.
