Abstract
The thermoelectric material PbTe has been used in a wide variety of power generator applications. However, there is limited mechanical property data available for PbTe for temperatures above room temperature. This paper reports dynamic elastic moduli measured via resonant ultrasound spectroscopy on undoped and PbI2-doped polycrystalline PbTe between room temperature and 773 K; in addition, the room temperature carrier concentration was measured by a Hall effect experiment. The Young's modulus and shear modulus of PbTe decreased linearly with temperature above room temperature, while the Poisson's ratio exhibited either monotonic increase or decrease with temperature. The Young's modulus and shear modulus values obtained during heating and cooling agreed to within 1%. The dynamic elastic moduli data obtained in this study compared well in general with literature data. The difference observed between the current study and other literature studies is explained in terms of the carrier concentration effect on elastic moduli.
| Original language | English |
|---|---|
| Pages (from-to) | 5954-5963 |
| Number of pages | 10 |
| Journal | Acta Materialia |
| Volume | 56 |
| Issue number | 20 |
| DOIs | |
| State | Published - Dec 2008 |
| Externally published | Yes |
Funding
The authors acknowledge the financial assistance of the Office of Naval Research MURI Grant No. N000140310789 and the US Department of Energy Grant DE-FC26-04NT42281. The research work at the High Temperature Materials Laboratory was sponsored by the Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Freedom CAR and Vehicle Technologies, as part of the High Temperature Materials Laboratory User Program, Oak Ridge National Laboratory, managed by UT-Battelle, LLC, for the US Department of Energy under Contract No. DE-AC05-00OR22725.
Keywords
- Dynamic mechanical analysis
- Elastic behavior
- Semiconductor compounds
- Temperature-dependent