About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
|
Alloys and Compounds for Thermoelectric and Solar Cell Applications XII
|
Presentation Title |
Se Free n-type Bi2Te3: Synthesis, Sintering and Doping |
Author(s) |
Franck Gascoin, Amélie Galodé |
On-Site Speaker (Planned) |
Franck Gascoin |
Abstract Scope |
Reports of n-type Bi2Te3 are numerous, however, the best performing compositions always contain a sizable percentage of selenium and the process associated with the manufacturing of the material is sometimes very complex, this includes off stoichiometric nominal composition, multiples hot pressing and/or forging, nano-inclusions, micro or nano structure engineering. Interestingly, 25 years ago was reported a n-type conduction in the Bi-Sb-Te ternary system for the compositions Bi1.4Sb0.6Te3 and Bi1.6Sb0.4Te3 whether or not an excess of tellurium was added during the mechanical alloying synthesis. In this presentation, we will show a simple way to make n-type (Bi,Sb)2Te3 using mechanical alloying followed by a short SPS densification. We will also show that modification of the synthesis and processing parameters can lead to quite sizable variations in transport properties. This study opens the route to further optimization of selenium free n-type bismuth tellurides towards the replacement of the ancient Bi2Te3-xSex. |
Proceedings Inclusion? |
Planned: |
Keywords |
Electronic Materials, Energy Conversion and Storage, Other |