About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Alloys and Compounds for Thermoelectric and Solar Cell Applications X
|
Presentation Title |
Thermal Evolution of Internal Strain in Doped PbTe |
Author(s) |
James Patrick Male, Riley Hanus, G. Jeffrey Snyder, Raphael P. Hermann |
On-Site Speaker (Planned) |
James Patrick Male |
Abstract Scope |
Recent improvements in heat-to-electricity energy conversion efficiency in lead chalcogenide thermoelectrics involve reducing thermal conductivity by incorporating large amounts of internal strain. The extent to which typical thermoelectric processing techniques (like doping, ball milling, and densification) increase internal strain and dislocation density must be quantified to improve materials design. In this study, temperature dependent neutron powder diffraction is leveraged to evaluate the internal strain introduced by ball milling in doped and undoped PbTe from 50 K to 700 K. Na and/or Eu doping increases internal strain beyond ball milling alone with the greatest increase from combining the two dopants. Strain recovery occurs in each powder above 400 K but can be suppressed by co-doping – indicating strong dopant-dislocation interactions. This work provides key guidance for defect engineering to maximize internal strain and thermoelectric performance in PbTe thermoelectrics. |
Proceedings Inclusion? |
Planned: |
Keywords |
Energy Conversion and Storage, Characterization, Process Technology |